[squid-users] Store Disk files open

Hello,

For a few weeks now I've been tuning a squid to my network. I have
around 80Mb/s of HTTP traffic going through this server during most
of the day. I had a little of every possible trouble I can think of
and most of them are solved now after a few more white hair in my head
:)

Anyway... My only problem right now looks like some sort of disk I/O
problem. Consider the following:
File descriptor usage for squid:
        Maximum number of file descriptors: 32768
        Largest file desc currently in use: 24143
        Number of file desc currently in use: 23257
        Files queued for open: 2
        Available number of file descriptors: 9509
        Reserved number of file descriptors: 100
        Store Disk files open: 11399

Squid isn't really slow or anything right now... But the value on the
"Store disk files open" apparently never goes down and it is starting
to concern me...

Is there a way for some of this opened files to be stale, maybe?
Should I start to worry about a incoming crash or I just need to
recompile the whole thing with more max FDs?

Here's a little more info just to show the current load:

Squid Object Cache: Version 3.1.0.13-20090807
Start Time: Fri, 21 Aug 2009 21:53:42 GMT

Current Time: Sat, 22 Aug 2009 02:10:12 GMT

Connection information for squid:
        Number of clients accessing cache: 1714
        Number of HTTP requests received: 6344801
        Number of ICP messages received: 0
        Number of ICP messages sent: 0
        Number of queued ICP replies: 0
        Number of HTCP messages received: 0
        Number of HTCP messages sent: 0
        Request failure ratio: 0.00
        Average HTTP requests per minute since start: 24736.6
        Average ICP messages per minute since start: 0.0
        Select loop called: 189242493 times, 0.081 ms avg
Cache information for squid:
        Hits as % of all requests: 5min: 31.9%, 60min: 36.2%
        Hits as % of bytes sent: 5min: 8.1%, 60min: 8.9%
        Memory hits as % of hit requests: 5min: 27.2%, 60min: 26.7%
        Disk hits as % of hit requests: 5min: 39.9%, 60min: 37.5%
        Storage Swap size: 97730572 KB
        Storage Swap capacity: 95.4% used, 4.6% free
        Storage Mem size: 4096128 KB
        Storage Mem capacity: 100.0% used, 1801439850948198.5% free
        Mean Object Size: 29.26 KB
        Requests given to unlinkd: 0
Median Service Times (seconds) 5 min 60 min:
        HTTP Requests (All): 0.16775 0.23230
        Cache Misses: 0.23230 0.30459
        Cache Hits: 0.00091 0.02190
        Near Hits: 0.12106 0.25890
        Not-Modified Replies: 0.00000 0.00000
        DNS Lookups: 0.00190 0.01153
        ICP Queries: 0.00000 0.00000
Resource usage for squid:
        UP Time: 15389.656 seconds
        CPU Time: 6403.690 seconds
        CPU Usage: 41.61%
        CPU Usage, 5 minute avg: 36.83%
        CPU Usage, 60 minute avg: 41.76%
        Process Data Segment Size via sbrk(): 5909608 KB
        Maximum Resident Size: 0 KB
        Page faults with physical i/o: 8560

The cache filesystem, after a bit of test, was chosen to be ext2 and
squid was compiled like this:

./configure --prefix=/usr --build=x86_64-pc-linux-gnu
--host=x86_64-pc-linux-gnu --mandir=/usr/share/man
--infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc
--localstatedir=/var/lib --libdir=/usr/lib64 --sysconfdir=/etc/squid
--libexecdir=/usr/libexec/squid --localstatedir=/var
--datadir=/usr/share/squid --with-logdir=/var/log/squid
--with-default-user=squid --enable-removal-policies=lru,heap
--enable-external-acl-helpers=ip_user,session,unix_group
--enable-useragent-log --disable-cache-digests --with-large-files
--with-filedescriptors=32768 --disable-snmp --disable-ssl
--disable-icap-client --enable-zph-qos --disable-ipv6 --enable-caps
--enable-linux-netfilter --enable-async-io=36

--
Marcelus Trojahn