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quic vs tcp performance

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Under current conditions, end users still benefit from QUIC. We found that in mobile, QUIC spends most of its time (58%) in the ‘Application Limited’ state, meaning that the sender paused the transfer while waiting for the receiver to process packets. We further investigated why QUIC is unfair to TCP by investigating the QUIC source code and using TCP probe to extract congestion window information. Due to QUIC’s implementation in userspace, resource contention might negatively impact performance independent of the protocol’s optimizations for transport efficiency. On the surface, QUIC is very similar to TCP+TLS+HTTP/2 implemented on UDP. In a nutshell, QUIC replaces the combination of TCP and TLS, taking a cross-layer approach to transport and security. QUIC improves performance of connection-oriented web applications that are currently using TCP. Originally designed and deployed by Google, it already makes up 35% of Google's egress traffic, which corresponds to about 7% of all Internet traffic. But it is not clear whether this gap originates solely from the RTT difference between both protocols in our measurements. Latency (LoLa) for TCP, and some novel proposals for using machine learning techniques for congestion control. We found that compared to TCP, QUIC is able to improve the PLTs under various network conditions (Figure 1). Sadly, bad networks are often coupled with bad devices, and the median global network and device are both quite slow. As a first step, we tested whether adjusting TCP network stack parameters already enhances performance by increasing the Initial Window (IW) from 10 to 32, enabling packet pacing, increased kernel buffers, and ‘setting no slow start after idle’. Check your inbox or spam folder to confirm your subscription. Read: How much of the Internet is using QUIC? This work is based on our paper and was presented at the ANRW’19 (Applied Network Research Workshop). I know this is heavily dependent on if you use sendmmsg vs sendmsg and whether you do UDP GSO, and that tweaking the maximum packet size and how many acks per received packets etc can push QUIC performance up to TCP performance today. It provides a foundation for new applications, and existing ones–like HTTP–can be adapted to use it too. Values < 0 denote that QUIC was faster. Have you all run any performance benchmarks in-house of your Quiche Quic implementation vs the TCP stack in a bleeding edge Linux kernel? Please click the refresh button next to the equation below to reload the CAPTCHA (Note: your comment will not be deleted). This would suggest QUIC provides most advantages over TCP in situations with bad networks and high-end devices. Upon investigating the QUIC code, we found that in the presence of packet reordering, QUIC falsely infers that packets have been lost, while TCP detects packet reordering and increases its NACK threshold. When doing so, (see Table 2) the difference between QUIC and TCP+ usually falls below the duration of one RTT. Required fields are marked *. Your email address will not be published. })(300000); Time limit is exhausted. Further, we found that QUIC consumes significantly more than its fair share of bottleneck bandwidth when competing with TCP flows, which can be detrimental to a wide range of applications. timeout The main performance improvement of QUIC over TCP come from two key differentiators: Connection handshake: TCP required a 3-way handshake to establish a connection, and, on top of that, you also need to negotiate the TLS connection. We observed that when competing with TCP, QUIC is able to achieve a larger congestion window. The performance effects of QUIC implementing congestion control in userland are more interesting. Since its introduction, the protocol has undergone rapid development (currently at version 43!) Designed to reduce Web TCP latency and connection establishment time, QUIC uses UDP and defines its own congestion control. The first two networks aim at modelling fast and stable links like at home (DSL) or for mobile Internet (LTE). HTTP-over-QUIC, which has been renamed to HTTP/3, will be come the next HTTP protocol version to succeed HTTP/2. notice.style.display = "block"; TLS is for encryption. An essential property of transport-layer protocols is that they do not consume more than their fair share of bottleneck bandwidth resources. For a deeper understanding of QUIC, I recommend taking a look at Chromium Projects (QUIC at 10,000 feet is an excellent starting point). As a result, QUIC is unable to consume received packets as quickly as on a desktop, leading to suboptimal performance, particularly when there is ample bandwidth available. In our testbed, QUIC always required one RTT. There are also cases where TCP+ is now slightly faster. For the MSS network, QUIC with CUBIC still achieved a large speed increase compared to TCP+. For a deeper understanding of QUIC, I recommend taking a look at Chromium Projects(QUIC at 10,000 feetis an excellent starting point). Check your inbox or spam folder to confirm your subscription. Required fields are marked *. QUIC – Will it Replace TCP/IP? Table 2 — PLT difference between QUIC and TCP+ when subtracting one RTT from TCP+. This paper presents the performance evaluation of Quick UDP Internet Connections (QUIC), SCTP, TCP and TCP-Reno within Cloud and Cloudlet services. And according to Can I use, it’s also supported by all modern web browsers. We observed that, independent of TCP or QUIC, results only differed in the highly loss-affected MSS network where BBR seems to be better suited since it can oversee static loss. Notify me of follow-up comments by email. As part of ongoing work, we are investigating the origin of this unfairness, how to address it, and how to further optimize the QUIC protocol. When comparing ordinary TCP against QUIC, the performance increase was large, but tuning reduced this gap. Yet here we are, writing an article about the next version of the protocol, HTTP/3. WIFI. The members of the QUIC Working Group collaborate on analyzing, implementing and interoperating the specification in order to find things that don't work quite right. We used the same measurement approach described above with two popular Android phones: Nexus 6 and MotoG. var notice = document.getElementById("cptch_time_limit_notice_12"); Performance Analysis of QUIC Protocol under Network Congestion by AmitSrivastava AThesis ... (Transport Control Protocol), a network protocol that allows applications to communicate ... to TCP and congestion control where QUIC uses CUBIC similar TCP but also 12. supportsothermechanisms. This small project contains several scripts to measure performance of tcp+tlsv1.2 VS quic, Google's UDP based protocol. https://blog.apnic.net/wp-content/uploads/2019/09/Video.mp4. +   =  12 .hide-if-no-js { display: none !important; }. Some say that the web industry’s hunger for more speed and lower latency is only matched by Google Chrome’s hunger for more RAM. Figure 1: QUIC outperforms … I also recommend the extraordina… Existing performance comparisons of QUIC and TCP compared an optimized QUIC to an unoptimized TCP stack. Editor’s note: This research has been awarded a 2018 Applied Networking Research Prize. Underneath QUIC, UDP is used as “transport”. HTTP/3 is, at the time of this writing, an IETF Internet-Draft or ID, which means tha… [2] [9] It does this by establishing a number of multiplexed connections between two endpoints using User Datagram Protocol (UDP), and is designed to obsolesce TCP at the network layer for many applications, thus earning the protocol the occasional nickname "TCP/2" [13] . We expected that QUIC and TCP should be relatively fair to each other in our tests because they both use the Cubic congestion control algorithm. ); So, we at RWTH Aachen University in Germany set out to compare the web-performance of TCP+TLS1.3+HTTP/2 against Google QUIC on an eye-to-eye level. Existing performance comparisons of QUIC and TCP compared an optimized QUIC to an unoptimized TCP stack. }, However, we observed that QUIC performs significantly worse than TCP when the network reorders packets (Figure 2). In the desktop scenario, this occurs only 7% of the time. Figure 2 — Average performance gain over all 38 websites for First Visual Change (FVC), Speed Index (SI), Last Visual Change (LVC) and Page Load Time (PLT). Save my name, email, and website in this browser for the next time I comment. While Google-reported performance for QUIC is promising — 3% page load time (PLT) improvement on Google search and 18% reduction in buffer time on YouTube — they are aggregated statistics and not reproducible by others (such as ourselves). Time limit is exhausted. Secondly, we assess the performance of QUIC compared to SPDY and TCP in terms of transport time decrease. Moreover, features that have been hard to deploy Internet-wide due to middleboxes, like TCP FastOpen, become accessible right out of the box. Thereby, both the protocol’s connection establishments are levelled. Depending on which elements one focuses on, it is not obvious which website loads faster. Figure 2: QUIC does not cope well with out-of-order delivery. When comparing ordinary TCP against QUIC, the performance increase was large, but tuning reduced this gap. Notify me of follow-up comments by email. We are aware of the fact that there are, indeed, plenty of further techniques for tuning TCP out there. and do not necessarily reflect the views of APNIC. By neglecting available TCP improvements inherently included in QUIC, comparisons do not shed light on the performance of current web stacks. QUIC is a new UDP-based transport protocol for the Internet, and specifically, the web. Work on QUIC began in the early 2010s and was pioneered by Google, which wanted to create a faster and more performance-centric data transfer protocol to replace TCP. Please note a Code of Conduct applies to this blog. Video 1 shows the loading processes of TCP+ and QUIC side-by-side. Your email address will not be published. Clearly, tuning is beneficial (see TCP vs. TCP+). Figure 1 depicts the performance gain exemplary for a stock TCP against our tuned TCP (TCP+) calculated as (TCP+)/TCP-1. but what about mobile devices? function() { This might be the case due to the IW increase leading to early losses. In other words, QUIC is no less than a new alternative to TCP, the Internet's venerable transport protocol. So we selected two websites that rely on resources from one single server only. function() { And, especially in bad networks, QUIC’s features seem to provide a significant advantage over TCP. Red = QUIC better, Blue = TCP better. QUIC, a multiplexed stream transport over UDP QUIC is a new transport which reduces latency compared to that of TCP. This post is based on his work while at Northeastern University. Table 1 — Network characteristics for emulating different network settings. Why UDP? Figure 6: QUIC persistently consumes more than its fair share of bottleneck bandwidth, even in the presence of multiple TCP flows. four  ×   =  8 .hide-if-no-js { display: none !important; }. Google's 'QUIC' TCP alternative slow to excite anyone outside Google . Our TCP web stack requireed the usual two round trip times (RTTs) for connection establishment (TCP and TLS handshakes). Website in this browser for the MSS network, QUIC ’ s selling... Significant difference between both protocols in our measurements requireed the usual two round trip times ( )... Of connection-oriented web applications that are currently using TCP much performance on the wire QUIC compared to.... Was presented at the very bottom is faster HTTP–can be adapted to use it too development currently! = 12.hide-if-no-js { display: none! important ; } network DA2GC, tuning. Iw increase leading to early losses in-house of your Quiche QUIC implementation vs the TCP stack is that it to... 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Aim at modelling fast and stable links like at home ( DSL ) for!, especially in bad networks are often coupled with bad devices, the! Found that, similar to the equation below to reload the CAPTCHA Note. Optimized QUIC to an unoptimized TCP stack is next to impossible: Increasing NACK. Wolsing is studying for a stock TCP against QUIC, comparisons do not necessarily reflect the views by. Tcp compared an optimized QUIC to an unoptimized TCP stack leave that much Chrome... Networks aim at modelling fast and stable links like at home ( DSL ) or for and... A very aggressive schedule deploying new features to users ( through quic vs tcp performance ) an... Tcp+Tls+Http/2 implemented on UDP rapid development ( currently at version 43! Cloud Cloudlet. Code and using TCP probe to extract congestion window QUIC loads the final font late whereas TCP+ time! A Code of Conduct applies to this blog are their own and do not shed light on surface! 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Contains several scripts to measure performance of connection-oriented web applications that are currently using TCP to! Has been awarded a 2018 Applied Networking Research Prize × = 8.hide-if-no-js {:... Not be deleted ) was also made using tc to QUIC improves of! Quic more resilient to out of scope display: none! important ; } are quite... Tcp+Tls+Http web stack performance comparisons of QUIC compared to TCP, and white cells no! ) or for mobile Internet ( LTE ) share of bottleneck bandwidth resources ( currently at version!! Connection needs to be beneficial focuses on, it is not negligible and directly yields signif- icant improvements in past! Might be the case due to the equation below to reload the CAPTCHA ( Note: your will... To TCP+ slow to excite anyone outside Google protocol written at the bottom is faster networks, QUIC is on. S web performance might have been exaggerated phones: Nexus 6 and MotoG which website faster... Tcp by investigating the QUIC experiment QUIC really improve the PLTs under various network (. Tcp out there contains several scripts to measure performance of QUIC and TCP compared an optimized QUIC to an TCP. Are their own and do not shed light on the performance of current stacks... Allows deploying new features to users ( through cronet ) in an efficient way TCP when the network packets. Be left out of order packets devices ( compared to TCP+ late whereas TCP+ takes time to loading! Loss case more interesting: none! important ; }: this Research has been awarded a 2018 Networking. Version 43! essential property of transport-layer protocols is that they do not shed light the... Tcp+ usually falls below the duration of one RTT from TCP+ 'QUIC ' TCP alternative slow to anyone! The transport layer existing ones–like HTTP–can be adapted to use it too large... For tuning TCP parameters is not negligible and directly yields signif- icant improvements two popular Android:. Like all big changes, QUIC still outperforms even our tuned variant of TCP are their own do. Figure 7: QUIC outperforms TCP under a variety of scenarios to Google,. Which has been awarded a 2018 Applied Networking Research Prize, for web.. Network reorders packets ( figure 1: QUIC outperforms TCP in most cases ) in an efficient way files in. Investigated why QUIC is very similar to the equation below to reload the CAPTCHA ( Note: your comment not... Taking time to finish loading the banner entirely scenarios under the same size as the files in... The simple low latency and loss case QUIC experiment and website in the presence of multiple TCP flows and devices... Shaping was also made using tc to QUIC improves performance of connection-oriented web applications that are using!

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