Date: Tue, 28 Dec 2004 21:23:23 +0100 (CET) From: Sten Spans <sten@blinkenlights.nl> To: Joe Koberg <joe@osoft.us> Cc: freebsd-stable@freebsd.org Subject: Re: TIMEOUT - WRITE_DMA - A possible FIX! turn off ACPI Message-ID: <Pine.SOC.4.61.0412282113070.22265@tea.blinkenlights.nl> In-Reply-To: <41D0C51D.8020800@osoft.us> References: <20041209183911.068c9a84.kutizs@axelero.hu> <41D0C51D.8020800@osoft.us>
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This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. ---559023410-851401618-1104265403=:22265 Content-Type: TEXT/PLAIN; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8BIT On Mon, 27 Dec 2004, Joe Koberg wrote: > Zsolt Kúti wrote: > >> My system produces these messages that I already know well from this >> list (as well ;): >> ad4: TIMEOUT - WRITE_DMA retrying (2 retries left) LBA=213249674 >> >> > So I rebooted the freshly installed 5.3-R without ACPI, and It works! > I can read at 50MB/s per drive concurrently (hitting PCI bus speed > limit?), and write at 30MB/s per drive concurrently. No errors so > far, and its been dd'ing for a half hour. Regular PCI and PCI-X (eXtended) is: 33hmz/32bits 132 Megabyte 66mhz/32bits 264 Megabyte 66mhz/64bits 520 Megabyte 100mhz/64bits 784 Megabyte 133mhz/64bits 1040 Megabyte etc. With overhead included I'd say 100 Megabyte is pretty reasonable for a normal pci bus. Keep in mind that this is for the whole bus, which is why most server motherboard have multiple seperate busses. PCI-X is an extension to regular pci, with more mhz/bits. PCI-E ( Express ) is a redesign with higher speeds and fewer traces needed. The big problem with 64bits pci is not the slot but the fact that you have to run all those extra (fast) lines to the slots which means that you'll need extra space (mainly layers) to store them, ergo an expensive motherboard. HTH, HAND. -- Sten Spans "There is a crack in everything, that's how the light gets in." Leonard Cohen - Anthem ---559023410-851401618-1104265403=:22265--
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