Date: Thu, 19 Apr 2012 23:22:24 +0200 From: Luigi Rizzo <rizzo@iet.unipi.it> To: "K. Macy" <kmacy@freebsd.org> Cc: Andre Oppermann <andre@freebsd.org>, current@freebsd.org, net@freebsd.org Subject: Re: Some performance measurements on the FreeBSD network stack Message-ID: <20120419212224.GA95459@onelab2.iet.unipi.it> In-Reply-To: <CAHM0Q_M4wcEiWGkjWxE1OjLeziQN0vM%2B4_EYS_WComZ6=j5xhA@mail.gmail.com> References: <20120419133018.GA91364@onelab2.iet.unipi.it> <4F907011.9080602@freebsd.org> <20120419204622.GA94904@onelab2.iet.unipi.it> <CAHM0Q_M4wcEiWGkjWxE1OjLeziQN0vM%2B4_EYS_WComZ6=j5xhA@mail.gmail.com>
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On Thu, Apr 19, 2012 at 10:34:45PM +0200, K. Macy wrote: > >> This is indeed a big problem. ?I'm working (rough edges remain) on > >> changing the routing table locking to an rmlock (read-mostly) which > > > > This only helps if your flows aren't hitting the same rtentry. > Otherwise you still convoy on the lock for the rtentry itself to > increment and decrement the rtentry's reference count. > > > i was wondering, is there a way (and/or any advantage) to use the > > fastforward code to look up the route for locally sourced packets ? actually, now that i look at the code, both ip_output() and the ip_fastforward code use the same in_rtalloc_ign(...) > > > > If the number of peers is bounded then you can use the flowtable. Max > PPS is much higher bypassing routing lookup. However, it doesn't scale > to arbitrary flow numbers. re. flowtable, could you point me to what i should do instead of calling in_rtalloc_ign() ? cheers luigi
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