Messages in this thread | | | Date | Mon, 10 Feb 2014 22:14:45 +0100 | From | Thomas Glanzmann <> | 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 |
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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
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