Date: Tue, 11 Jan 2005 11:15:09 -0800 From: Jeff Behl <jbehl@fastclick.com> To: Mohan Srinivasan <mohan_srinivasan@yahoo.com> Cc: freebsd-net@freebsd.org Subject: Re: %cpu in system - squid performance in FreeBSD 5.3 Message-ID: <41E425BD.709@fastclick.com> In-Reply-To: <20050111185033.73879.qmail@web80602.mail.yahoo.com> References: <20050111185033.73879.qmail@web80602.mail.yahoo.com>
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Yes, I believe the kqueue version of squid would show much better results. Unfortunately it fails to compile and I have yet the time to try mucking with it more. I'll get back to the list when I am able to get it up and running... jeff Mohan Srinivasan wrote: >Following up to a mail from Jeff Behl and Sean Chittenden back in Dec. > >http://lists.freebsd.org/pipermail/freebsd-net/2004-December/006074.html > >From your description, it looks like moving a kqueue based Squid will >help considerably (it looks like there is a version of Squid that >is kqueue based - not sure how stable that is though). If you drop a quick >kernel profile, you will see most of the system CPU being spent in select() >caused polling of descriptors. In my previous experience with a Squid-based >proxy several years ago, once you dropped more than a couple of hundred >connections into select(), CPU utilization spiked sharply because of >the descriptor polling. > >We then hoisted Squid on top of a (homebrew) version of kqueue, which >caused system CPU to drop dramatically, because all the descriptor polling >was avoided. > >mohan > > >
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