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Message-ID: <20140208165539.GA22359@glanzmann.de> Date: Sat, 8 Feb 2014 17:55:39 +0100 From: Thomas Glanzmann <thomas@...nzmann.de> To: Eric Dumazet <eric.dumazet@...il.com> Cc: 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: [PATCH] tcp: disable auto corking by default Hello Eric, > > Disable auto corking by default > We should let auto corking on during 3.14 development cycle so that we > can fix the bugs, and thing of some optimizations. I agree that leaving it enabled helps to find bugs, however I'm not happy with the round trip time degradation. > auto cork gives a strong incentive to applications to use > TCP_CORK/MSG_MORE to avoid overhead of sending multiple small > segments. I agree. But if it breaks the application many people won't be happy, for example I spend already 5 hours to track it down. > In the normal case, the extra delay is something like 10 us, so if an > application is really hit by this delay, its a strong sign it could be > improved, especially if auto corking is off. Yes, but 230 micro seconds for others. :-( > Lets wait the end of 3.14 dev cycle before considering this patch. I agree. Btw. I mixed up the pcaps for autocork on and off, so I moved the files that they know show what they should show. 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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