netdev - 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: <20140208135838.GC20512@glanzmann.de>
Date:	Sat, 8 Feb 2014 14:58:38 +0100
From:	Thomas Glanzmann <thomas@...nzmann.de>
To:	Eric Dumazet <eric.dumazet@...il.com>
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]

Hello Eric,

> What is your NIC model and driver?

I have four Intel Corporation I350 Gigabit Network Connection (rev 01).

(node-62) [~/work/linux-2.6] lspci -v | pbot
http://pbot.rmdir.de/rgu6yHMBDVQpflMmbcJACg
(node-62) [~/work/linux-2.6] ip a s | pbot
http://pbot.rmdir.de/xJjRT8u-ekC6mrWgl09ZtQ
(node-62) [~/work/linux-2.6] dmesg | pbot
http://pbot.rmdir.de/MigrSPtxGmp0fI1CRgXsHw

I do 802.3ad link aggregation layer 2 hash with two network cards to one
switch.

I'm running:
Linux node-62 3.14.0-rc1+ #23 SMP Sat Feb 8 14:27:47 CET 2014 x86_64 GNU/Linux

Driver: igb

If you need remote access to the machine let me know.

Cheers,
        Thomas
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