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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 ? -- 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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