RE: [squid-users] Problem with RAM usage with squid

Also, if you are using Linux-2.4, then make sure to use iptables and not
ipchains for the interception. ipchains REDIRECT is broken in many
Linux-2.4 versions, causing a kernel memory leak which will eventually
make your machine completely halt due to lack of memory..

Regards
Henrik

mån 2003-03-31 klockan 19.38 skrev Henrik Nordstrom:
> Please try to answer the questions below.
>
> Regards
> Henrik
>
> mån 2003-03-31 klockan 17.25 skrev Tushar Gupta:
> > Hi,
> >
> > The problem of RAM in our configuration remains unsolved. Another thing
> > we noticed is that swap used as seen by free command always remains
> > zero. Does it give any clue on what may be the problem.
> >
> > We use squid in httpd accelerator mode (interception)
> >
> > Thanks for any suggestions
> >
> > Tushar
> >
> > -----Original Message-----
> > From: Henrik Nordstrom [mailto:hno@squid-cache.org]
> > Sent: Friday, February 21, 2003 1:35 AM
> > To: Tushar Gupta; squid-users@squid-cache.org
> > Subject: Re: [squid-users] Problem with RAM usage with squid
> >
> > Why would you want to do such a thing?
> >
> > The "buffer/cache" is automatically returned if applications need more
> > memory.
> >
> > Your problem is elsewhere. You say the idle CPU goes to zero. Which
> > application is usin all your CPU? (see top).
> >
> > And how much memory is reported by free in the "+/- buffers/cache"
> > row?
> >
> > Regards
> > Henrik
> >
> > On Thursday 20 February 2003 15.54, Tushar Gupta wrote:
> > > Hi,
> > >
> > > Is there any mechanism by which I can flush or free up RAM without
> > > need to reboot the server
> > >
> > > Tushar
> > >
> > >
> > > -----Original Message-----
> > > From: Henrik Nordstrom [mailto:hno@squid-cache.org]
> > > Sent: Tuesday, January 28, 2003 2:53 PM
> > > To: Tushar Gupta; squid-users@squid-cache.org
> > > Subject: Re: [squid-users] Problem with RAM usage with squid
> > >
> > > The free ram as reported by top should only be a few MB when a
> > > server has been in use for a while. What is not used by
> > > applications should be used by bufffer/cache.
> > >
> > > See the output of free for a better reading of "free" ram.
> > >
> > > What to watch is the swap usage. On a Squid server the swap usage
> > > should be low and not increasing.
> > >
> > >
> > > This said, there has been a number of memory leaks in early
> > > Linux-2.4 kernels. Upgrading to a current 2.4 kernel is most likely
> > > recommended.
> > >
> > > The most commonly hit issue by Squid useds it that the ipchains
> > > REDIRECT target was utterly broken up to 2.4.18 something. Use the
> > > native Linux-2.4 iptables command instead.
> > >
> > > Regards
> > > Henrik
> > >
> > > On Tuesday 28 January 2003 08.18, Tushar Gupta wrote:
> > > > Hi,
> > > >
> > > > We are using squid for caching, with SCSI disk and 512 MB RAM.
> > > > The cache_mem setting in squid.conf is 64 MB. After running for
> > > > several hours total free RAM (as seen by top command) reduces to
> > > > few kilobytes and server response time increases (CPU idle cycles
> > > > also go to zero), and we need to reboot the server. Though as
> > > > percentage of total CPU usage squid is usually taking around
> > > > 15-30%CPU and percentage of RAM as 12-15%MEM . After rebooting
> > > > the server would again run fine for several hours say half a day,
> > > > and then RAM would gradually get consumed again.
> > > >
> > > > It is Linux 7.1 , Kernel 2.4.2-2 on i686 (PII 350 Mhz), squid
> > > > version 2.3.stable4. Server also has other services like
> > > > DNS/qmail but they take negligible CPU/RAM
> > > >
> > > > Any suggestions are welcome.
> > > >
> > > > Thanks
> > > > Tushar

-- 
Henrik Nordstrom <hno@squid-cache.org>
MARA Systems AB, Sweden