This may not be related, but when I was working with Centos 5 in a Vmware environment, I ran into an issue of high cpu since the default clock rate with Linux 2.6 is 1000Hz. I changed to a 100Hz clock rate and got much lower cpu usage.
I'm not sure if that is your issue, perhaps FC14 was using less than a 1000Hz clock rate. You might try a tickless kernel, or dig further into what clock rate your kernel is using. I don't know where the authoritative source for this information is, but here's what I found with a search: http://yate.null.ro/pmwiki/index.php?n=Main.YateAndVMWare On Mon, Jul 25, 2011 at 3:43 PM, Christopher Stanton <christopher.stan...@codaxus.com> wrote: > I have a MJPEG streaming system which uses mod_perl in the web > interface to supply the final stream to the client. > > I am seeing high cpu utilization under RHEL5.6 which I don't see on > FC14. We are talking sub 10% on FC14 vs 80% on EL5. This is on > different hardware, but not that different. And on EL5 the httpd > session is way higher (cpu wise) than the supplying proxy. On FC14 on > my test rig I see (for a 25fps stream) 15-18% CPU for the proxy which > can handle multiplexing etc and 5.5-8% for the mod_perl httpd session. > > I think this is an issue with that platform, but I haven't seen > any/many reports. Does anyone have a sec to look at the source? I > don't think I have implemented this is a horrible inefficient way but > who knows. It is true, I could have byte markers and then know the > size of the JPEG I am expecting rather than just splitting on the > boundary field, but in tests (and production) it seemed to work ok. > > http://svn.codaxus.com/flexTPS/2.x.x/trunk/portal/2.4.x/site/perl/nph-mjpeg_stream.pl > > Any comments or critiques would be appreciated, > Christopher > > ---------------------------------------------------------------------- > > On FC14: > Requires: httpd >= 2.2.17-1 > Requires: mod_perl >= 2.0.4-11 > Requires: mod_ssl >= 1:2.2.17-1 > Requires: perl >= 5.12.3-141 > Requires: perl-CGI >= 3.51-1 > Requires: perl-Digest-SHA1 >= 2.12-4 > Requires: perl-XML-Filter-BufferText >= 1.01-9 > Requires: perl-XML-Simple >= 2.18-7 > Requires: perl-XML-Validator-Schema >= 1.10-5 > Requires: perl-Tree-DAG_Node >= 1.06-8 > Requires: perl-LDAP >= 0.40-2 > Requires: perl-Crypt-SSLeay >= 0.58-1 > Requires: ffmpeg >= 0.6-4 > > On EL5: > Requires: httpd >= 2.2.3-45 > Requires: mod_perl >= 2.0.4-6 > Requires: mod_ssl >= 2.2.3-45 > Requires: perl >= 5.8.8-32 > Requires: perl-Digest-SHA1 >= 2.11-1 > Requires: perl-XML-Filter-BufferText >= 1.01 > Requires: perl-XML-Simple >= 2.14-4 > Requires: perl-XML-Validator-Schema >= 1.10-1 > Requires: perl-Tree-DAG_Node >= 1.06 > Requires: perl-LDAP >= 0.33-3 > Requires: perl-Crypt-SSLeay >= 0.51-11 > Requires: ffmpeg >= 0.6.1-1 >
