From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Mosberger Date: Sat, 24 Jan 2004 06:06:58 +0000 Subject: Re: [PATCH] 2.6.1 enable PIOW/DMAR relaxed ordering on ZX1 Message-Id: <16402.2946.80534.644026@napali.hpl.hp.com> List-Id: References: <20040123024302.GD24857@cup.hp.com> In-Reply-To: <20040123024302.GD24857@cup.hp.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org >>>>> On Thu, 22 Jan 2004 18:43:02 -0800, Grant Grundler said: Grant> Tony, David, I lied. Apologies. I thought I had sent this Grant> patch before but was just confused by the change in my local Grant> bk tree. I had the patch sitting there since September. :^( Grant> This enables DMA Reads to bypass PIO Writes for all PCI/PCI-X Grant> devices. On older RHAS (2.1 orig), this improved netperf UDP Grant> Stream by ~10%. Testing on kernel.org 2.4 kernels showed Grant> only ~3-5% improvement. I suspect because of improvements to Grant> tg3 driver. Grant> diff is against http://lia64.bkbits.net/linux-ia64-2.6/ I'm not sure Tony's tree is ready for prime-time yet. Could you please diff against my tree instead (linux-ia64-2.5)? I'd have merged the patch by hand, but the context in the patch you posted doesn't look like anything that appears in the current sba_iommu.c. Thanks, --david