Date: Tue, 1 Mar 2005 01:40:19 GMT From: "Jason Hitt" <jhitt25@swbell.net> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/78216: WRITE_DMA UDMA ICRC errors while copying data to a disk Message-ID: <200503010140.j211eJNl024258@freefall.freebsd.org>
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The following reply was made to PR kern/78216; it has been noted by GNATS.
From: "Jason Hitt" <jhitt25@swbell.net>
To: <freebsd-gnats-submit@FreeBSD.org>, <jhitt25@swbell.net>
Cc:
Subject: Re: kern/78216: WRITE_DMA UDMA ICRC errors while copying data to a disk
Date: Mon, 28 Feb 2005 19:36:28 -0600
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I tested both UDMA33 and UDMA66 modes on ad0 and ad2.
My test consisted of the following:
- cp -R of a 1 gigabyte directory to the same gmirror volume.
- An FTP push of 1 gigabyte of data from another host.
- An FTP pull of 1 gigabyte of data from another host.
No DMA errors occurred at either UDMA33 or UDMA66. Attempting the same =
test in UDMA100 mode almost immediately resulted in errors on ad0 and =
caused gmirror to drop ad0 from the mirror volume.
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<DIV><FONT face=3DArial size=3D2>I tested both UDMA33 and UDMA66 modes =
on ad0 and=20
ad2.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>My test consisted of the =
following:</FONT></DIV>
<DIV><FONT face=3DArial size=3D2> - cp -R of a 1 =
gigabyte=20
directory to the same gmirror volume.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2> - An FTP push of 1 =
gigabyte of=20
data from another host.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2> - An FTP pull of 1 =
gigabyte of=20
data from another host.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>No DMA errors occurred at either UDMA33 =
or=20
UDMA66. Attempting the same test in UDMA100 mode almost =
immediately=20
resulted in errors on ad0 and caused gmirror to drop ad0 from the mirror =
volume.</FONT></DIV>
<DIV> </DIV></BODY></HTML>
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