Re: [2.4.17/18pre] VM and swap - it's really unusable

Stephan von Krawczynski (skraw@ithnet.com)
Fri, 4 Jan 2002 14:05:18 +0100


On Fri, 4 Jan 2002 10:06:05 +0200
Ville Herva <vherva@niksula.hut.fi> wrote:

> On Thu, Jan 03, 2002 at 11:26:01PM -0600, you [Ken Brownfield] claimed:
> >
> > | > 3) Memory allocation failures and OOM triggers
> > | > even though caches remain full.
> > |
> > | I have not had one up to now in everyday life with 2.4.17
> >
> > I'm seeing this in malloc()-heavy apps, but fairly sporadic unless I
> > create a test case.
>
> I'm seeing this on 2GB IA64 (2.4.16-17). I posted a _very_ simple test case
> to lkml a while a go. It didn't happen on 256MB x86.
>
> I plan to try -aa shortly, now that I got patches to make it compile on
> IA64.

Ok, I am going to buy more mem right now to see what you see.

Regards,
Stephan

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noapic on any and all SMP
> | > machines that I've ever run on.
> |
> | I am currently running 5 Asus CUV4X-D based SMP boxes all with apic
> | _on_, amongst which are squids, sql servers, workstation type setups
> | (2 my very own).
>
> Do they have *sustained* heavy hit/IRQ/IO load? For example, sending
> 25Mbit and >1,000 connections/s of sustained small images traffic
> through khttpd will kill 2.4 (slow loss of timer and eventual total
> freeze) in a couple of hours. Trivially reproducable for me on SMP with
> any amount of memory. On HP, Tyan, Intel, Asus... etc.

Hm, I have about 24GB of NFS traffic every day, which may be too less. What
exactly are you seeing in this case (logfiles etc.)?

> It's not that the kernel is bad, it's that there are specific things
> that shouldn't be forgotten because of a "the kernel is good"
> evaluation.

Hopefully nobody does this here, I don't.

> Like I said, I suspect that most people with machines in lower-load
> environments don't have these issues, but "number of people effected" is
> only one metric to judge the importance of an issue.

The number of people is not really interesting for me, as the boxes get bigger
every day it is only a matter of time to see more people with lots of GB (as an
example).

> Of course, I'm not biased or anything. ;-)

How could you ? ;-))

Regards,
Stephan

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