Re: REGRESSION f54b311142a92ea2e42598e347b84e1655caf8e3 tcp autocorking slows down iSCSI file system creation by factor of 70 [WAS: 4 TBVMFS creation takes 15 minutes vs 26 seconds]

From: Eric Dumazet
Date: Sat Feb 08 2014 - 08:53:43 EST

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In reply to: Thomas Glanzmann: "Re: REGRESSION f54b311142a92ea2e42598e347b84e1655caf8e3 tcp autocorking slows down iSCSI file system creation by factor of 70 [WAS: 4 TBVMFS creation takes 15 minutes vs 26 seconds]"
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On Sat, 2014-02-08 at 14:37 +0100, Thomas Glanzmann wrote:
> Hello Eric,

>
> It fixes my case but if you look at the round trip time it is not even
> close what it used to be. So while this fixes my problem I'm still for
> disabling it by default.
>
> https://thomas.glanzmann.de/tmp/tcp_auto_corking_on_patched.pcap.bz2
> https://thomas.glanzmann.de/tmp/screenshot-mini-2014-02-08-14:36:25.png

Very nice.

Now we have to check your NIC and how TX completion is performed.

What is your NIC model and driver ?

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