Date: Wed, 14 Aug 2013 12:40:19 -0700 From: Peter Wemm <peter@wemm.org> To: Adrian Chadd <adrian@freebsd.org> Cc: Lawrence Stewart <lstewart@freebsd.org>, Lev Serebryakov <lev@freebsd.org>, Luigi Rizzo <rizzo@iet.unipi.it>, FreeBSD Net <net@freebsd.org> Subject: Re: it's the output, not ack coalescing (Re: TSO and FreeBSD vs Linux) Message-ID: <CAGE5yCrdptEAK7y_qBM3Og9U45o1_0ZtN0ANXg6WwXNTqX-1GQ@mail.gmail.com> In-Reply-To: <CAJ-VmokxgWKeuPFGEE-wzLcYpyt3Ua90JZH2BBTj39LoTSUsMg@mail.gmail.com> References: <520A6D07.5080106@freebsd.org> <520AFBE8.1090109@freebsd.org> <520B24A0.4000706@freebsd.org> <520B3056.1000804@freebsd.org> <20130814102109.GA63246@onelab2.iet.unipi.it> <587579055.20130814154713@serebryakov.spb.ru> <CAJ-VmokxgWKeuPFGEE-wzLcYpyt3Ua90JZH2BBTj39LoTSUsMg@mail.gmail.com>
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On Wed, Aug 14, 2013 at 11:11 AM, Adrian Chadd <adrian@freebsd.org> wrote: > On 14 August 2013 04:47, Lev Serebryakov <lev@freebsd.org> wrote: > > >> And we should invalidate this info on ARP/route changes, or connection >> will be lost in such cases, am I right?.. So, on each such event code >> should look into all sockets and check, if routing/ARP information is >> still >> valid for them. Or we should store lists of sockets in routing and ARP >> tables... I don't know, what is worse. >> > > .. or per-CPU copies of the ARP table.. ? Local cache at each consumer and check a generation number to see if it needs to be re-validated before using. The obvious problem with this though is that big networks tend to kill your caches. -- Peter Wemm - peter@wemm.org; peter@FreeBSD.org; peter@yahoo-inc.com; KI6FJV UTF-8: for when a ' just won\342\200\231t do. <brueffer> ZFS must be the bacon of file systems. "everything's better with ZFS"
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