From: Anton Blanchard <anton@samba.org>
To: Brice Goglin <brice@myri.com>
Cc: netdev@vger.kernel.org, gallatin@myri.com,
linux-kernel@vger.kernel.org, benh@kernel.crashing.org
Subject: Re: [PATCH 3/4] myri10ge - Driver core
Date: Thu, 25 May 2006 07:21:17 +1000 [thread overview]
Message-ID: <20060524212117.GD5938@krispykreme> (raw)
In-Reply-To: <4474138C.2050705@myri.com>
Hi,
> We didn't get any ppc64 with PCI-E to run Linux so far. What performance
> drop should we expect with our current code ?
We have seen > 20% improvement on ppc64 running some networking
workloads when forcing 128 byte alignment (instead of 16 byte
alignment). DMA writes have to get cacheline aligned (in power of 2
steps) on some IO chips.
> I am not sure what you mean.
> The only ppc64 with PCI-E that we have seen so far (a G5) couldn't do
> write combining according to Apple.
Im thinking more generally, MTRRs are x86 specific and it would be good
to have a more generic way to enable write combining.
Anton
next prev parent reply other threads:[~2006-05-24 21:24 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-17 22:02 [PATCH 0/4] myri10ge - Myri-10G Ethernet driver - v2 Brice Goglin
2006-05-17 22:03 ` [PATCH 1/4] myri10ge - Revive pci_find_ext_capability Brice Goglin
2006-05-17 22:04 ` [PATCH 2/4] myri10ge - Driver header files Brice Goglin
2006-05-17 22:28 ` Randy.Dunlap
2006-05-18 23:36 ` Brice Goglin
2006-05-17 22:06 ` [PATCH 3/4] myri10ge - Driver core Brice Goglin
2006-05-17 22:36 ` Roland Dreier
2006-05-18 23:38 ` Brice Goglin
2006-05-17 23:08 ` Arnd Bergmann
2006-05-18 23:56 ` Brice Goglin
2006-05-19 1:55 ` Arnd Bergmann
2006-05-19 2:25 ` Brice Goglin
2006-05-19 10:00 ` Arnd Bergmann
2006-05-19 11:09 ` Andi Kleen
2006-05-19 15:48 ` Brice Goglin
2006-05-20 7:58 ` Brice Goglin
2006-05-19 14:39 ` Brice Goglin
2006-05-19 23:15 ` Brice Goglin
2006-05-20 0:01 ` Andi Kleen
2006-05-23 15:39 ` Anton Blanchard
2006-05-24 8:04 ` Brice Goglin
2006-05-24 21:21 ` Anton Blanchard [this message]
2006-05-25 7:59 ` Benjamin Herrenschmidt
2006-05-25 9:07 ` Brice Goglin
2006-05-25 7:56 ` Benjamin Herrenschmidt
2006-05-26 9:49 ` Ingo Oeser
2006-05-26 10:02 ` Benjamin Herrenschmidt
2006-05-26 10:30 ` Jeff Garzik
2006-05-26 10:56 ` Benjamin Herrenschmidt
2006-05-17 22:07 ` [PATCH 4/4] myri10ge - Kconfig and Makefile Brice Goglin
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