Date: Wed, 1 Oct 2003 18:13:48 -0400 (EDT) From: Robert Watson <rwatson@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/net netisr.c Message-ID: <Pine.NEB.3.96L.1031001180240.16031Q-300000@fledge.watson.org> In-Reply-To: <200310012131.h91LV9fd042464@repoman.freebsd.org>
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On Wed, 1 Oct 2003, Robert Watson wrote:
> Enable net.isr.enable by default, causing "delivery to completion"
> (direct dispatch) in interrupt threads when the netisr in question
> isn't already active. If a netisr is already active, or direct
> dispatch is already in progress, we queue the packet for later
> delivery. Previously, this option was disabled by default. I have
> measured 20%+ performance improvements in IP packet forwarding with
> this enabled.
>
> Please report any problems ASAP, especially relating to stack depth or
> out-of-order packet processing.
>
> Discussed with: jlemon, peter
> Sponsored by: DARPA, Network Associates Laboratories
FYI: In my e-mail communication with Jonathan, we concluded this was safe
to commit. Since then, two concerns have come up:
(1) Potential lock order interactions. I believe these are OK given the
current model of dropping the driver lock before entering the
interface input routines. However, since the ground doesn't appear to
be firm here quite yet...
(2) Potential out-of-order delivery if a packet is delayed and ends up in
the netisr queue, and is bypassed by a following packet which is
delivered first by virtue of direct dispatch, which can have negative
consequences for TCP in lossy situations if the timing is poor.
I've attached two patches: one that simply defers the dispatch again
if there's the potential for reordering. The other drains the netisr
queue before processing the new mbuf. Both have potential downsides,
and neither is tested. (I'll do that when I get home this evening),
but I'm virtually in transit as I write this :-).
I'm going to back out this change for now, but would like to merge it
again once we're sure any potential issues have been resolved. In the
mean time, I think it would be very useful if people interested in network
performance could run with net.isr.enable enabled, and pick zero or one of
the patches to apply. This evening I'll run lossy TCP performance
measurements with a packet sniffer and timing tweaks, and see what I bump
into. I'm hopeful we can enable this by default shortly, as the
performance benefit is substantial.
Robert N M Watson FreeBSD Core Team, TrustedBSD Projects
robert@fledge.watson.org Network Associates Laboratories
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