Re: [squid-users] Performance and stupid questions

 
> I runnning Linux/Squid on BiPro 1GHZ 1GB Ram with 2x9,1 GB Raid 1
> Hard drives. With a polygraph test (polymix 1), I reach a 200req/sec
> load (without redirectors).

Which kernel?

> But I wonder why the ratio is so different. Moreover, when I run a
> "top" command, i can clearly see that only one processor is really
> working : squid seems to work only on one processor at a time.

Squid is probably I/O bound. And due to it's architecture it cannot
take advantage of another processor.

RAID 1 doesn't help either. Better use different disks or a RAID 0 --
after all Squid's data partitions are expendable!

The money would have been better invested in more disks, not more
processors. Plan before you buy!

> Partitions are extfs3.

Uh, that's bound to be slow. Mount the data area for Squid noatime,
maybe in writeback mode, instead of ordered mode. That will be faster.

Still faster are XFS and ReiserFS.

We use this machine:

Dell Poweredge (don't know which)
2GB RAM
Intel(R) Xeon(TM) CPU 2.80GHz

/dev/sda8 on / type auto (rw,errors=remount-ro)
proc on /proc type proc (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
/dev/sdb5 on /squid-cache0 type xfs (rw)
/dev/sdc5 on /squid-cache1 type xfs (rw)
/dev/sdd5 on /squid-data type xfs (rw)
/dev/sda5 on /boot type ext3 (rw)

Filesystem Size Used Avail Use% Mounted on
/dev/sda8 13G 5.7G 6.5G 47% /
/dev/sdb5 17G 15G 2.5G 86% /squid-cache0
/dev/sdc5 17G 15G 2.5G 86% /squid-cache1
/dev/sdd5 17G 5.0G 12G 30% /squid-data
/dev/sda5 69M 9.0M 56M 14% /boot

At a real-world load (production use) of 200 connections/s it has a
load of 0.75.

-- 
Ralf Hildebrandt (Im Auftrag des Referat V a)   Ralf.Hildebrandt@charite.de
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