Date: Sat, 8 Apr 1995 09:27:14 -0700 (PDT) From: "Rodney W. Grimes" <rgrimes@gndrsh.aac.dev.com> To: smpatel@wam.umd.edu (Sujal Patel) Cc: wilko@yedi.iaf.nl, hackers@FreeBSD.org Subject: Re: large filesystems/multiple disks [RAID] Message-ID: <199504081627.JAA15477@gndrsh.aac.dev.com> In-Reply-To: <Pine.BSD.3.91.950408120722.145k-100000@xi.dorm.umd.edu> from "Sujal Patel" at Apr 8, 95 12:11:22 pm
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> > > On Sat, 8 Apr 1995, Rodney W. Grimes wrote: > > > No, they just don't perform well. The scsi command over head is high > > on them. I am not sure if this applies to the 24F, but the 34F is a > > bus pig (it grabbs the vlb bus for long periods of time, locking out > > other interrupts :-(). > > That is very true, the card is a hog. My ISA busmaster ethernet card > spews errors all the time during heavy disk activity. The U24F has an > option in the EISA config which can help this (Maximum Bus Hold Time? or > something like that)... I think it's set to 500us(ns?) by default, You can > lower it to 250us(ns) which helps some. > > Do you think that there is anything that can be done in the driver that > could help this? Possible, but with out owning a card, and without any documentation on that card, and given the fact there are much more cost effective solutions to it avaliable now I don't want to spend any time on it. You are welcome to pursu this though :-) > Also, I know that U24F Bios Version 2.01+ has a lot of fixes in the > Scatter/Gather Code on the card. Can someone with a card with 2.01+ Bios > give us some benchmarks please? > > Sujal > -- Rod Grimes rgrimes@gndrsh.aac.dev.com Accurate Automation Company Custom computers for FreeBSD
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