Re: BUG: Slowdown on 3000 socket-machines tracked down

[Christian Schmid]

OHGAWD I GOT IT!!!!!!!!

I admit, totally coincidentially but its really FIXED. Today I went to the puter scanning the 
servers by routine and wondered why the bandwidth is at 100% without any holes.

The only thing I have done is I switched off hyper-threading because the server is at only 20% CPU 
anyway so I just disabled it.

So its something with linux dealing with hyper-threading. YAY :)

Andrew Morton wrote:
> Christian Schmid <webmaster@xxxxxxxxxxxxxx> wrote:
>
> > > So, maybe a VM problem?  That would be a good place to focus since
> > > I think we can be fairly certain it isn't a problem in just the
> > > networking code.  Otherwise, my tests would show lower bandwidth.
> >
> > Thanks to your tests I am really sure that its no network-code problem anymore. But what I THINK it 
> > is: The network is allocating buffers dynamically and if the vm doesnt provide that buffers fast 
> > enough, it locks as well.
>
>
> Did anyone have a 100-liner which demonstrates this problem?
>
> The output of `vmstat 1' when the thing starts happening would be interesting.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/