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Message-ID: <20140208133847.GB20512@glanzmann.de> Date: Sat, 8 Feb 2014 14:38:47 +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, > Also make sure you have commit a181ceb501b31b4bf8812a5c84c716cc31d82c2d > ("tcp: autocork should not hold first packet in write queue") > in your tree. confirmed: (node-62) [~/work/linux-2.6] git show a181ceb501b31b4bf8812a5c84c716cc31d82c2d | head commit a181ceb501b31b4bf8812a5c84c716cc31d82c2d Author: Eric Dumazet <edumazet@...gle.com> Date: Tue Dec 17 09:58:30 2013 -0800 tcp: autocork should not hold first packet in write queue Willem noticed a TCP_RR regression caused by TCP autocorking on a Mellanox test bed. MLX4_EN_TX_COAL_TIME is 16 us, which can be right above RTT between hosts. 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
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