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Date: Wed, 27 Aug 2003 22:51:45 -0400 (EDT)
From: Robert Watson <rwatson@freebsd.org>
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To: Bill Moran <wmoran@potentialtech.com>
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Subject: Re: Some additional tests run on my performance testing
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On Wed, 27 Aug 2003, Bill Moran wrote:

> Unfortunately (as you'll see) the results were _worse_ than with FreeBSD
> 5.1. 
..
> ad0s1a: UDMA ICRC error writing fsbn 1458368 of 729184-729215 (ad0s1 bn 1458368; cn 241 tn 12 sn 44) retrying
> ad0s1a: UDMA ICRC error writing fsbn 1458368 of 729184-729215 (ad0s1 bn 1458368; cn 241 tn 12 sn 44) retrying
> ad0s1a: UDMA ICRC error writing fsbn 1458368 of 729184-729215 (ad0s1 bn 1458368; cn 241 tn 12 sn 44) retrying
> ad0s1a: UDMA ICRC error writing fsbn 1458368 of 729184-729215 (ad0s1 bn 1458368; cn 241 tn 12 sn 44) falling back to PIO mode

Question: did 5.1 keep the drive as UMA, but 4.8 back it off to PIO?

Did you look at any of the blocksize-related patches that have been
floating around? 

Robert N M Watson             FreeBSD Core Team, TrustedBSD Projects
robert@fledge.watson.org      Network Associates Laboratories