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Date: Tue, 29 Nov 2011 21:27:35 +0100 From: Dave Taht <dave.taht@...il.com> To: Rick Jones <rick.jones2@...com> Cc: netdev@...r.kernel.org Subject: Re: is non-inheritance of congestion control algorithm from the listen socket a bug or a feature? Hey, thx for trying it! On Tue, Nov 29, 2011 at 9:03 PM, Rick Jones <rick.jones2@...com> wrote: > > Is the non-inheritance of the congestion control algorithm a bug or a > feature? Hmm... It's kind of both. Recently I submitted an RFC patch to the rsync mailing list, and it seemed nice to be able to set it on a per socket basis based on various configuration options in the rsync conf file and what was explicitly allowed. That patch is here: https://lists.samba.org/archive/rsync/2011-November/027111.html It was also way cool to see tcp-lp in action vs other sorts of tcp. That said we have a range of allowable congestion algorithms ranging from more intense than cubic to low bandwidth to wireless, to highly specialized (data center tcp), to some that require both sides to be running the same alg, others that are server only... Your question sort of involves what should a user be able to set. On the one hand, in the general case an app should not be allowed to choose a more aggressive tcp. On the other hand, an app on a wireless box, requesting/getting, say, westwood over a default of lp or cubic sort of makes sense. On the gripping hand I thiink pushing this level of decison making out to the app is just fine by me, so inherit or not, is the app's call to setsockopt... And in netperf's case, that would be all the algs made available via allowable_congestion_control. I had another idea regarding pushing alternate tcp algos out to more apps without requiring source code changes, which would be to create a cgroup controller, which would be both trendy and would provide 'inherit-ability'... But first up I think would be for more folk to see how cool different algos can be. > > rick jones > -- > 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 > -- Dave Täht SKYPE: davetaht US Tel: 1-239-829-5608 FR Tel: 0638645374 http://www.bufferbloat.net -- 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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