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Message-ID: <1391867404.10160.88.camel@edumazet-glaptop2.roam.corp.google.com> Date: Sat, 08 Feb 2014 05:50:04 -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 05:33 -0800, Eric Dumazet wrote: > On Sat, 2014-02-08 at 05:14 -0800, Eric Dumazet wrote: > > Here is the combined patch, could you test it ? > > Also make sure you have commit a181ceb501b31b4bf8812a5c84c716cc31d82c2d > ("tcp: autocork should not hold first packet in write queue") > in your tree. > > BTW this problem demonstrates there is room for improvement in iCSCI, using MSG_MORE to avoid sending two small segments in separate frames. [1] 00:32:35.726568 IP 10.101.99.5.3260 > 10.101.0.13.27778: Flags [P.], seq 145:193, ack 144, win 235, options [nop,nop,TS val 4294960733 ecr 385385], length 48 [2] 00:32:35.838074 IP 10.101.0.13.27778 > 10.101.99.5.3260: Flags [.], ack 193, win 514, options [nop,nop,TS val 385396 ecr 4294960733], length 0 [3] 00:32:35.838099 IP 10.101.99.5.3260 > 10.101.0.13.27778: Flags [P.], seq 193:705, ack 144, win 235, options [nop,nop,TS val 4294960761 ecr 385396], length 512 [1] & [3] could be coalesced, and [2] would be avoided. -- 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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