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

Christian Schmid
2005-03-11T15:29:46Z

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@rapidforum.com> 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.
>
>