lkml.org 
[lkml]   [2002]   [Sep]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Early SPECWeb99 results on 2.5.33 with TSO on e1000
> I thought that I already tried to explain this to you.  (although 
> it could have been on one of those too-much-coffee-days :)

You told me, but I'm far from convinced this is the problem. I think
it's more likely this is a side-effect of a server issue - something
like a lot of dropped packets and retransmits, though not necessarily
that.

> Something strange happens to the clients when NAPI is enabled on
> the Specweb clients. Somehow the start using a lot more CPU.
> The increased idle time on the server is because the _clients_ are
> CPU maxed. I have some preliminary oprofile data for the clients,
> but it appears that this is another case of Specweb code just
> really sucking.

Hmmm ... if you change something on the server, and all the clients
go wild, I'm suspicious of whatever you did to the server. You need
to have a lot more data before leaping to the conclusion that it's
because the specweb client code is crap.

Troy - I think your UP clients weren't anywhere near maxed out on
CPU power, right? Can you take a peek at the clients under NAPI load?

Dave - did you ever try running 4 specweb clients bound to each of
the 4 CPUs in an attempt to make the clients scale better? I'm
suspicious that you're maxing out 4 4-way machines, and Troy's
16 UPs are cruising along just fine.

M.

-
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 13:28    [from the cache]
©2003-2014 Jasper Spaans. Advertise on this site