linux-kernel - Re: REGRESSION f54b311142a92ea2e42598e347b84e1655caf8e3 tcp auto corking slows down iSCSI file system creation by factor of 70 [WAS: 4 TB VMFS creation takes 15 minutes vs 26 seconds]

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Message-ID: <1391867614.10160.89.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Sat, 08 Feb 2014 05:53:34 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Thomas Glanzmann <thomas@...nzmann.de>
Cc:	John Ogness <john.ogness@...utronix.de>,
	Eric Dumazet <edumazet@...gle.com>,
	"David S. Miller" <davem@...emloft.net>,
	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
	target-devel <target-devel@...r.kernel.org>,
	Linux Network Development <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: REGRESSION f54b311142a92ea2e42598e347b84e1655caf8e3 tcp auto
 corking slows down iSCSI file system creation by factor of 70 [WAS: 4 TB
 VMFS creation takes 15 minutes vs 26 seconds]

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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