[squid-users] high iowait on cache_swap_low

hey

We are using 2 x 320GB SATA2 with reiserfs 3.6. The machine experiences high iowait when the cache reaches cache_swap_low. What we have observed that it is constantly stuck at cache_swap_low. If we purge the cache it starts to work fine again until cache hits cache_swap_low mark.

We are using:

cache_swap_low 94
cache_swap_high 95
 
Our settup
 
<*> Squid Cache: Version 2.7.STABLE6
configure options:  '--enable-async-io'
'--enable-icmp' '--enable-snmp' '--enable-cache-digests' '--enable-follow-x-forwarded-for'
'--enable-storeio=aufs,ufs,null,diskd,coss' '--enable-removal-policies=heap,lru'
'--with-maxfd=65535' '--disable-ident-lookups' '--enable-truncate' '--enable-linux-tproxy'
'--enable-linux-tproxy' '--enable-large-cache-files'
 
<*> Kernel 2.6.31.13
 
<*> Debain lenny 5.04
<*> ~300 requests/sec
machine is setup in bridge mode with tproxy transparent, with ip configured on br0 interface.
 
any help will be much appreciated.
 
thanks in advance
                                               
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Received on Tue Jun 01 2010 - 12:38:28 MDT