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SubjectRe: Error 3c900 driver in 2.2.19?


On Tue, 28 Aug 2001, Andrew Morton wrote:

> Roy Sigurd Karlsbakk wrote:
> >
> > On Tue, 28 Aug 2001, Andrew Morton wrote:
> >
> > > Possibly, VM system changes have taken you over some threshold.
> > > Are you putting a lot of traffic through that machine?
> >
> > There's <= 2500 messages (sendmail - usually <5 concurrently) going
> > through per day, some 10.000 pop connections per day (mostly at working
> > hours). The server's got some 256 megs of RAM, and is doing some small
> > databases with postgresql and mysql in addition to the apache server. The
> > server does not have any problems with swapping, as the text below should
> > show.
> >
> > As far as I can see from linux/mm/swap.c, it shouldn't have anything to do
> > with freepages... Am I wrong?
> >
> > roy
> >
> > [root@server log]# free
> > total used free shared buffers cached
> > Mem: 257876 252976 4900 64120 65156 147368
> > -/+ buffers/cache: 40452 217424
> > Swap: 136512 268 136244
> >
>
> Networking needs to allocate memory at interrupt time. This is
> referred to as "atomic allocation". The only way in which this
> can be successful is for the VM system to ensure that there is
> a pool of immediately-allocatable memory lying around.
>
> The 2.2 kernel uses the tunables in /proc/sys/vm/freepages to
> decide how large that pool should be. Machines which sustain
> a high network load commonly require more memory than the
> default freepages setting provides. People who encounter network
> Rx allocation failures with 2.2 kernels do report that increasing
> the freepages tunables fixes the problem.
>
> -
>

Thanks

But... Should the server hang after experiencing problems with this? On
2.2.19?

ory

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