I recently installed Varnish to sit in front of Apache on a dedicated server running a single site. It appears to be working well, but the load on Apache is still very high. What doesn't make sense is that the Apache access log shows almost no traffic getting past Varnish. When I tail the apache log I see about 1-3 hits per second come through.

Here is what the load on Apache looks like :

USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
apache   13834  8.1  1.0 107716 34164 ?        S    08:24   0:02 /usr/sbin/httpd
apache   13835  8.1  1.0 107716 33856 ?        S    08:24   0:02 /usr/sbin/httpd
apache   11483  7.9  0.9 105916 30788 ?        S    08:23   0:06 /usr/sbin/httpd
apache   12255  7.5  1.0 107476 33312 ?        S    08:24   0:04 /usr/sbin/httpd
apache    9340  7.2  1.1 107732 34916 ?        R    08:23   0:09 /usr/sbin/httpd
apache   12029  6.8  0.9 106908 30416 ?        S    08:24   0:04 /usr/sbin/httpd
apache   11577  6.7  1.0 107192 34180 ?        S    08:24   0:05 /usr/sbin/httpd
apache   11486  6.6  1.0 106176 33112 ?        S    08:23   0:05 /usr/sbin/httpd
apache   11796  6.4  1.0 106936 31916 ?        S    08:24   0:04 /usr/sbin/httpd
apache   13815  6.3  1.0 107988 34464 ?        S    08:24   0:02 /usr/sbin/httpd
apache   18089  6.3  1.3 107444 43212 ?        S    08:11   0:52 /usr/sbin/httpd
apache   11797  5.9  1.0 107716 34580 ?        S    08:24   0:04 /usr/sbin/httpd
apache    7655  5.9  0.0      0     0 ?        Z    08:22   0:09 [httpd] <defunct>
mysql     8033  5.9  6.2 318240 199512 ?       Sl   May14 352:34 /usr/libexec/mysqld --basedir=/usr --datadir=/var/lib/mysql --user=mysql --pid-file=/va
apache   11488  5.8  0.9 106924 31632 ?        S    08:23   0:04 /usr/sbin/httpd
apache    9375  5.7  1.1 106956 35552 ?        S    08:23   0:07 /usr/sbin/httpd
apache    3551  5.6  1.1 106956 36140 ?        S    08:20   0:14 /usr/sbin/httpd
apache    7657  5.6  1.0 106968 32472 ?        S    08:22   0:09 /usr/sbin/httpd
apache   11433  5.6  1.0 107716 34396 ?        S    08:23   0:04 /usr/sbin/httpd
apache    5505  5.5  1.1 106944 34924 ?        S    08:21   0:12 /usr/sbin/httpd
apache    7172  5.3  1.1 106972 35368 ?        S    08:22   0:09 /usr/sbin/httpd
apache   10088  5.2  0.9 106160 31240 ?        S    08:23   0:04 /usr/sbin/httpd
apache    7656  5.1  1.0 106436 34388 ?        S    08:22   0:08 /usr/sbin/httpd
apache    3468  5.0  1.1 107716 35968 ?        S    08:20   0:13 /usr/sbin/httpd
apache   14242  4.8  1.0 107728 33032 ?        S    08:25   0:00 /usr/sbin/httpd
apache    3578  4.8  1.1 107988 35964 ?        S    08:20   0:12 /usr/sbin/httpd
apache   28192  4.8  1.2 106944 38060 ?        S    08:17   0:23 /usr/sbin/httpd
apache    3277  4.6  1.1 106956 35688 ?        S    08:20   0:13 /usr/sbin/httpd
apache   15434  3.7  0.7 106908 24684 ?        S    08:25   0:00 /usr/sbin/httpd

There is a default apache log and then one other VirtualHost log setup.

I'm concerned that Apache is handling some kind of traffic that is not being logged. Is that possible? And is there anything I can do to capture that traffic?