Re: Network Stack Locking

From: Robert Watson (rwatson_at_freebsd.org)
Date: 05/25/04

  • Next message: Julian Elischer: "Re: Network Stack Locking" 
    Date: Tue, 25 May 2004 14:41:50 -0400 (EDT)
To: Luigi Rizzo <rizzo@icir.org>

    On Tue, 25 May 2004, Luigi Rizzo wrote:

    > On Tue, May 25, 2004 at 11:20:49AM -0700, Matthew Dillon wrote:
    > ...
    > > :Actually, this was the specific point I was making also :-). The question
    > > :I was asking was about the depth of the message queues between protocol
    > > :stack layers in actual measurements -- are you observing substantial
    > > :coallescing between layers as a result of the queues at this point? I'm
    > ...
    > > It should also be noted that since today's processors are so damn fast,
    > > actually maxing out the cpu before maxing out the PCI bus(es), at least
    > > on a standard workstation, is difficult.
    >
    > that's where the soekris comes handy :) (yes i understand that much of
    > the issues here are related to SMP, but there lot of evidence that a
    > non-smp 5.x kernel is significantly slower than the equivalent 4.x code,
    > even on heavy network i/o loads, so there is certainly something to
    > clean up there too).

    Happily, I'm well endowed with old and crufty hardware when it comes to
    UP. That said, it's hard to find a nice middle ground with SMP -- even
    relatively slow boxes can typically can max out 32-bit PCI, so you need to
    go with 64-bit if you want to not have that be the bottleneck for gig-E.

    Robert N M Watson FreeBSD Core Team, TrustedBSD Projects
    robert@fledge.watson.org Senior Research Scientist, McAfee Research

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