Re: %cpu in system - squid performance in FreeBSD 5.3

From: Jeff Behl (jbehl_at_fastclick.com)
Date: 01/04/05

  • Next message: Sean Chittenden: "Re: %cpu in system - squid performance in FreeBSD 5.3" 
    Date: Tue, 04 Jan 2005 10:58:27 -0800
To: Sean Chittenden <sean@chittenden.org>

    back from vacation...

    i did try STABLE, with the same results:

    FreeBSD www2.cdn 5.3-STABLE FreeBSD 5.3-STABLE #2: Sun Dec 5 21:06:14
    PST 2004 root@www2.cdn:/usr/obj/usr/src/sys/SMP amd64

    interestingly enough, i got a reply on a squid list from someone on a
    linux box who had similar results:
    -
    I've got a dual proc Xeon (3GHz) Linux 2.4.26 system running one squid
    2.5.5 as reverse proxy without cache, I use squidguard to route
    different path of the same domain to different clusters.

    Top shows:
    Cpu1 : 39.3% user, 58.0% system, 0.0% nice, 2.7% idle
    -

    so perhaps this is some gross problem with squid?

    jeff

    Sean Chittenden wrote:

    >> As a follow up to the below (original message at the very bottom), I
    >> installed a load balancer in front of the machines which terminates the
    >> tcp connections from clients and opens up a few, persistent connections
    >> to each server over which requests are pipelined. In this scenario
    >> everything is copasetic:
    >
    >
    > Interesting... I wonder what the lock contention path is between the
    > VM and network stack. Has anyone else noticed this in their testing?
    > Did you try a post-5.3 release or not? rwatson@ just MFC'ed a bunch
    > of network locking fixes to RELENG_5, but none-stand out in my mind as
    > being something that'd potentially fix your issue. Actually, he
    > probably knows better than anyone what this could be. Some of the
    > post RELENG_5_3 commits by alc@ could explain this, however, and is
    > why I ask what the specific version/build time is for your release. -sc
    >

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  • Next message: Sean Chittenden: "Re: %cpu in system - squid performance in FreeBSD 5.3"

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