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From: Grant Grundler <grundler@parisc-linux.org>
To: Kurt Fitzner <kfitzner@excelcia.org>
Cc: parisc-linux@lists.parisc-linux.org
Subject: Re: [parisc-linux] B132L outperforms C160 - 64-bit userland needed?
Date: Sat, 20 Aug 2005 00:21:35 -0600	[thread overview]
Message-ID: <20050820062135.GA28839@colo.lackof.org> (raw)
In-Reply-To: <43041C3C.2080704@excelcia.org>

On Wed, Aug 17, 2005 at 11:27:24PM -0600, Kurt Fitzner wrote:
...
> Next off, for nbench running on a C160/HPUX I see a memory throughput
> increase of 2.67X, integer calc increase of 1.4X, and floating point
> increase of 2.24X when compared to the C160/Linux.
...
> The performance issue on my C160/Linux was not due cache line
> loading/thrashing.
...
> What really locked it in for me that it's an OS issue,
...

It clearly is an OS issue. And thinking about it more,
I'm convinced this benchmark is exposing a cache utilization
(or lack thereof) issue. HPUX is very efficient at
NOT flushing the cache. Linux flushes alot more.

thanks,
grant
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  parent reply	other threads:[~2005-08-20  6:21 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-08-16  9:23 [parisc-linux] B132L outperforms C160 - 64-bit userland needed? Kurt Fitzner
2005-08-16 13:00 ` Michael S. Zick
2005-08-17  0:03   ` Kurt Fitzner
2005-08-17  1:32     ` John David Anglin
2005-08-17  1:48       ` Michael S. Zick
2005-08-17  3:43       ` Kurt Fitzner
2005-08-17  6:37         ` Grant Grundler
2005-08-17 14:16         ` John David Anglin
2005-08-17  6:19 ` Grant Grundler
2005-08-17 18:42   ` Kurt Fitzner
2005-08-17 18:56     ` Kyle McMartin
2005-08-17 19:40     ` Andrew Sharp
2005-08-18  5:27       ` Kurt Fitzner
2005-08-18  7:17         ` Grant Grundler
2005-08-20  6:21         ` Grant Grundler [this message]
2005-08-17 20:38   ` Carlos O'Donell
  -- strict thread matches above, loose matches on Subject: below --
2005-08-18  8:27 Joel Soete
2005-08-20  6:26 ` Grant Grundler
     [not found]   ` <430778F2.8020406@tiscali.be>
     [not found]     ` <20050820234126.GA20524@colo.lackof.org>
2005-08-21  9:42       ` Joel Soete
     [not found]       ` <20050820235516.GE2756@parcelfarce.linux.theplanet.co.uk>
2005-08-21 10:29         ` Joel Soete
2005-08-21 14:19           ` Matthew Wilcox

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