lkml.org 
[lkml]   [2002]   [Mar]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: Tyan S2466 MPX integrated ethernet interrupt happy
Date

> > So, approximately 8.5 million ethernet interrupts. The system is
> > noticably slower when streaming ethernet data, and it's sucking
> > up a lot more processing time than on my other much slower other
> > box. This box is running a stock 2.4.18 kernel from kernel.org
> > (i.e. no custom hacks). It's running 2 1800+ XPs.
>
> That all looks normal. Could you be more specific about
> the performance problems? How much slower? Output from
> `top' and `ps'? Any nasty messages in the system log?

No nasties in the syslog. System usage from top averages 50% per
CPU. (By system I mean kernel usage, bounces between 70 and 30 per
CPU)

> Looking at the ethernet driver won't help, I expect - it's
> as efficient as most any other driver. If there is a problem,
> it lies elsewhere...

Gotcha, yes that could definetly be. This was extraordinarily
unscientific. I was thinking maybe someone had seen something else
like this on this platform. So, I'll write a test that isolates
ethernet from other stuff like ide performance, etc.

> A kernel profile would be illuminating. Build the kernel with as
> few modules as possible, boot the machine with `profile=1' and play
> with readprofile.

Will do when I return.

Thanks,
Shane Nay.
(Someone else noted their /proc/interrupts for the same machine, but
my box had only been up for 1.5 hours :)
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:25    [W:0.051 / U:11.312 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site