That explains it. I experiment using proxy-only to serve this big object through squid from an apache on the same server. The cpu usage of squid+apache is cut nearly in half. Perhaps a combination of squid+apache would do well here, just a bit of complication to save this big object once the squid has it so that apache can serve it too. Thanks, Khanh -----Original Message----- From: Henrik Nordstrom [mailto:henrik@xxxxxxxxxxxxxxxxxxx] Sent: Thursday, August 09, 2007 6:51 AM To: NGUYEN, KHANH, ATTSI Cc: squid-users@xxxxxxxxxxxxxxx Subject: Re: High CPU usage for large object On tis, 2007-08-07 at 13:25 -0400, NGUYEN, KHANH, ATTSI wrote: > So perhaps the squid has some extra overhead. However, 3 times more > seems unusual 3 times more is probably quite right for disk hits. Apache uses sendfile() while Squid reads in the object from disk to write it out again on the socket.. And if you are using aufs or diskd this is being bounced via threads further adding overhead. Regards Henrik
