Re: [squid-users] squid performance epoll. 350req/sec 100% cpu

On Thu, 2006-05-25 at 08:06 +0800, Steven Wilton wrote:
>
> The epoll patch does add the ENTRY_DEFER_READ flag to connections regardless
> of whether epoll is actually being used or not. This flag allows squid to
> skip a few tests in the deferred handler. The presence of these messages in
> your cache log shows that you've applied the epoll patch successfully.
>
Yes the patch itself has been applied with no errors, but it (epoll) is
not necessarily being used. The
file /usr/src/redhat/BUILD/squid-2.5.STABLE13/include/autoconf.h after
installing the patch and running configure, but not running
bootstrap.sh, doesn't contain the lines:

   /*
    * Supports epoll
    */
   #define HAVE_EPOLL 1

So the patch is applied but epoll is not being used.

> Check that your sysem supports epoll (linux 2.6 kernel)
>
It's a 2.6.16 kernel - Fedora Core 4 linux.

> and make sure you have --enable-epoll as an option to configure.
>
Yup, that's enabled as well as --disable-poll.

I have modified the squid.spec file to run bootstrap.sh just before
configure. Whilst this seems to be okay (bootstrap.sh runs okay;
configure runs okay), I now get errors from the rpmbuild near the end:

RPM build errors:
    File not found: /var/tmp/squid-2.5.STABLE13-root/etc/squid/mib.txt
    File not found: /var/tmp/squid-2.5.STABLE13-root/usr/share/squid

It seems that the bootstrap.sh script has changed something such that
the file /usr/src/redhat/BUILD/squid-2.5.STABLE13/src/Makefile changes
from containing

    DEFAULT_MIB_PATH = $(sysconfdir)/mib.txt
to
    DEFAULT_MIB_PATH = $(datadir)/mib.txt

I'm not really familiar with the aclocal/autoconf/automake commands so
this will need a bit of investigating to see why the file location has
changed.

John.

-- 
---------------------------------------------------------------
John Horne, University of Plymouth, UK  Tel: +44 (0)1752 233914
E-mail: John.Horne@plymouth.ac.uk       Fax: +44 (0)1752 233839