From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jes Sorensen Date: Mon, 30 Jul 2001 22:12:07 +0000 Subject: Re: [Linux-ia64] IA64 Linux issues Message-Id: List-Id: References: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org >>>>> "Van" = Van Maren, Kevin writes: Van> I'm running Caldera's 6/20/01 snapshot (modified 2.4.4 kernel) on Van> a 4X, 8GB Lion. Van> Under even "light" I/O load (mkfs to 2-4 disks) I get horiffic Van> behavior -- basically what is described on this thread: Van> http://www.cs.helsinki.fi/linux/linux-kernel/2001-20/0763.html Van> [I/O drops down to < 300 I/Os per second (vmstat), but all the Van> CPUs are pegged 99%+ system time.] Van> That is after I first used "swiotlb240" at elilo to avoid the Van> panic, and then hacked the qlogicfc driver (patch at bottom) and Van> applied the latest Adaptec driver patch (6.2.0) from freebsd.org Van> to get 39-bit DMA. Problem occurs with 39160 & QL2200. I'd stay away from the qlogicfc.c driver, it's got all sorts of limitations. Jes