Re: [squid-users] cache dir limits

On Fri, 5 Dec 2003, Victor Ivanov wrote:

> > the Squid FAQ 8.11 How much memory do I need in my Squid server?
> > <url:http://www.squid-cache.org/Doc/FAQ/FAQ-8.html#ss8.11>
>
> That was the issue indeed. FreeBSD 5.1 comes with 512M hard data segment
> limit. There is an example for extending the limit for FreeBSD 3 and 2
> in the Squid FAQ, and it works with 5.1 too. There are even prepared
> values in /sys/conf/NOTES:
>
> options MAXDSIZ=(1024UL*1024*1024)
> options MAXSSIZ=(128UL*1024*1024)
> options DFLDSIZ=(1024UL*1024*1024)
>
> The pc has only 512M RAM. I'll measure the amount of swapin/outs and
> the impact on the performance.

Note: The FAQ entry talks about physical RAM requirements for the server
as such.

> Well, it's one of those cheap built-in Promise chips. Its write is
> really slow :(

Then there is most likely serious problems with your IDE bus. RAID0 does
not have a write penalty. Unless this IDE chip does not support DMA in
which case all I/O operations have a serious performance penalty from
competing about the CPU with applications..

> > Why this extremely large cache_mem?
>
> Well I don't know :) I'll put it to 128M or something. It'll probably
> decrease swap usage.

The default is generally fine, and you should be very careful to not
exceed what is said in the FAQ entry referenced above..

Regards
Henrik
Received on Fri Dec 05 2003 - 08:20:14 MST