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
| ||
|
Message-ID: <20140210211445.GE19621@glanzmann.de> Date: Mon, 10 Feb 2014 22:14:45 +0100 From: Thomas Glanzmann <thomas@...nzmann.de> To: Eric Dumazet <eric.dumazet@...il.com> Cc: "Nicholas A. Bellinger" <nab@...ux-iscsi.org>, John Ogness <john.ogness@...utronix.de>, Eric Dumazet <edumazet@...gle.com>, "David S. Miller" <davem@...emloft.net>, target-devel <target-devel@...r.kernel.org>, Linux Network Development <netdev@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] This extends tx_data and and iscsit_do_tx_data with the additional parameter flags and avoids sending multiple TCP packets in iscsit_fe_sendpage_sg Hello Eric, > Hmm.. I was not aware of high RTT for some packets. > Can you spot this on the pcap you provided ? with the latest patch as in: (node-62) [~/work/linux-2.6] git diff | pbot http://pbot.rmdir.de/CQwqI6b7wJProw_xaukmEg with net.ipv4.tcp_min_tso_segs=2 we had this pcap: https://thomas.glanzmann.de/tmp/tcp_auto_corking_on_patched_tcp_more_notlast.pcap.bz2 And here is the RTT TCP graph: Wireshark > Statistics > TCP Stream Graph > Round Trip Time Graph https://thomas.glanzmann.de/tmp/screenshot-mini-2014-02-10-22_04_30.png with net.ipv4.tcp_min_tso_segs=8 we have this pcap: https://thomas.glanzmann.de/tmp/tcp_auto_corking_on_patched_tcp_more_notlast_min_tso_segs_8.pcap.bz2 And here is the RTT TCP graph: Wireshark > Statistics > TCP Stream Graph > Round Trip Time Graph This gives us 0.0015 seconds RTT (1.5 ms) Without TCP autocorking we had 0.0005 (0.5 ms). https://thomas.glanzmann.de/tmp/screenshot-mini-2014-02-08-09:53:17.png Cheers, Thomas -- 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