lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Thu, 24 Apr 2008 22:06:11 +0900 From: "Shigeo N" <shigeonx@...il.com> To: "Andi Kleen" <andi@...stfloor.org> Cc: linux-kernel@...r.kernel.org, netdev@...r.kernel.org Subject: Re: XTP for 2.6.25 Now I have connected 2 hosts directly, and evaluate the each throughput. Then all the results of UDP, TCP and XTP are the same and 94Mbps. (My netwrok is 100Base/TX). In this case round-trip time between 2 hosts is less than 0.1ms because they are directly connected. But my previouse case, round-trip time between 2 hosts are 4ms. (I use IPSEC between the security gateways to increase delay). I think that's the reason TCP throughput is slow. If ACK packets are delayed, sending window cannot slide and sending packets cannot be fully bursted. If I changes wmem size through /proc/sys/net/ipv4/tcp_wmem, TCP's throughput may improve, but congestion control becomes more difficult for TCP. That is TCP's disadvantage to XTP. Best Shigeo On 4/24/08, Andi Kleen <andi@...stfloor.org> wrote: > "Shigeo N" <shigeonx@...il.com> writes: > > > > I tested in the network where UDP throughput is 29Mbps, then TCP > > throughput was 13Mbps, but XTP's reached to 25Mbps. > > One interesting question is why TCP was so much slower than UDP > on your test. It shouldn't be on a fair test setup. > > Please post details. Was the network losing packets? > > New protocols might be interesting, but even more interesting is to > fix any (real) problems in existing protocols. > > -Andi > -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists