Re: processes state "sokva"

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Mon, Nov 17, 2008 at 02:19:38PM -0600, Al - Image Hosting Services wrote:
> Hi,
> 
> >>I have been running several servers with lighttpd on them and it hasn't
> >>been a problem until lately. The process enters into a state of "sokva". I
> >>think this means that it is running out of memory for socket buffers. I
> >>tried building a kernel with: "option SOSEND_NO_LOAN", and although now it
> >>didn't give me a state of "sokva", some processes stopped responding. I
> >>built another kernel with:
> >>
> >>options         MAXFILES=16384
> >>options         NMBCLUSTERS=20480
> >>options         DFLDSIZ=402653184
> >>options         SHMMAXPGS=8192
> >>options         SYSVMSG
> >>options         SYSVSEM
> >>options         SYSVSHM
> >>options         MSGMNB=16384
> >>options         MSGSSZ=64
> >>options         MSGTQL=512
> >>
> >>But I commented out option SOSEND_NO_LOAN.
> >>
> >>I switched to apache, and still I was getting some processes that have a
> >>state of "sokva". I then "sysctl -w kern.somaxkva=33554432", it has not
> >>done it since then, but I haven't been pushing it as hard as I was.
> >>
> >>I think it could be that my kernel config caused this, or I wonder if
> >>there could be a mbufs memory leak. Any ideas?
> >
> >How much network load do you have ? You may well have a too low
> >kern.somaxkva for your workload ...
> 
> All my servers are pretty much maxed out as far as cpu usage goes. What 
> bothers me is that a kernel with "option SOSEND_NO_LOAN" didn't fix the 
> problem. Nothing would be waiting in "sokva", but still most process would 
> stop responding.

So maybe your system is really running out of network ressources ?

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--