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Date: Wed, 25 Aug 2010 10:21:39 +0200 From: Hagen Paul Pfeifer <hagen@...u.net> To: Jerry Chu <hkchu@...gle.com> Cc: Arnd Hannemann <hannemann@...s.rwth-aachen.de>, Eric Dumazet <eric.dumazet@...il.com>, <ilpo.jarvinen@...sinki.fi>, <davem@...emloft.net>, <netdev@...r.kernel.org> Subject: Re: [PATCH] TCP_FAILFAST: a new socket option to timeout/abort a connection quicker On Tue, 24 Aug 2010 15:13:44 -0700, Jerry Chu <hkchu@...gle.com> wrote: > On Tue, Aug 24, 2010 at 9:28 AM, Hagen Paul Pfeifer <hagen@...u.net> wrote: > So it looks like the user timeout can be used in either senario (shortening > or lengthening) and in both cases is a lower bound, i.e., the connection > should abort at or shortly after the specified user timeout. > > In this case does it make sense to combine the two? Will your TCP_UTO > patch be ready anytime soon? > > Again an alternative is to allow configuring tcp_retries2 and TCP_RTO_MAX > directly. I'm open to suggestion but we'd like to get something in sooner. Hello Chu! My Idea: you provide functionality to modify the user timeout. The interface should be generic enough to allow small as well as large - up to 22 days - values. This interface should be sufficient for you and later for me. Afterwards I provide an patch which apply on your groundwork. My patch handle TCP UTO specific functionality like TCP option protocol handling functionality, socket option, permissions, lower- and upper bounds, ... Did you check interactions with other TCP timers like keep-alive timer? Today in the evening I will focus on TCP Quick ACK modifications. After that I am in the Alps for vacation for 5 days. Later on I will work on the patch (the patch is in a good state, modification and testing should consume only 2 evenings - hopefully ;-). Cherry, is this ok for you? Hagen -- 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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