From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mike Hardy Subject: Re: [PATCH md 2 of 4] Fix raid6 problem Date: Sun, 13 Feb 2005 14:58:50 -0800 Message-ID: <420FDBAA.4010005@h3c.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit In-Reply-To: Sender: linux-raid-owner@vger.kernel.org Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids Mark Hahn wrote: >>Interesting - the private mail was from me, and I've got two dual >>Opterons in service. The one with significantly more PCI activity has >>significantly more problems then the one with less PCI activity. > > > that's pretty odd, since the most intense IO devices I know of > are cluster interconnect (quadrics, myrinet, infiniband), > and those vendors *love* opterons. I've never heard any of them > say other than that Opteron IO handling is noticably better than > Intel's. Sure, but which variables are changed between the rigs the vendors loved, and the rig we're having problems with? > otoh, I could easily believe that if you're running the Opteron > systems in acts-like-a-faster-xeon mode (ie, not x86_64), > you might be exercising some less-tested paths. Its running x86_64 (Fedora Core 3) and the problem is rooted in the chipset I believe. I don't think its Opterons per se, I think its just the Athlon take two - which is to say that its a wonderful chip, but some of the chipsets its saddled with are horrible, and careful selection (as well as heavy testing prior to putting a machine in service) is essential. -Mike