kern/78216: WRITE_DMA UDMA ICRC errors while copying data to a disk

[Andrey Smagin]

The following reply was made to PR kern/78216; it has been noted by GNATS.

From: Andrey Smagin <samspeedu at mail.ru>
To: freebsd-gnats-submit at FreeBSD.org
Cc:  
Subject: Re: kern/78216: WRITE_DMA UDMA ICRC errors while copying data to a disk
Date: Tue, 1 Mar 2005 09:45:26 +0300

 >>How-To-Repeat:
 JH>     Unknown if this is repeatable on any random system.  It appears to
 JH>     be an issue for many people, however, i did not see any reports of
 JH>     multiple drive configurations such as mine.  The fact that my second
 JH>     drive had no DMA issues while my first drive did may be revealing.
 
  I have old hardware 1 CPU, 2MBoard, 64MBram(iP~200, chipsets iTX, VIA), and
 tested next configuration ata0 master - 2.1Gb(UDMA33)(may normally detected by
 BIOS for loading), ata1 master WD120Gb(UDMA33)(data storage), on both
 motherboards it error was occured, with destroying data. Problem was resolved
 by disabling DMA.
  Also I have another PC as server(iP166/VIA/64MB) with 20GB(UDMA33) and
 120GB(UDMA100) (first for BIOS another for data), on it error was ocurred
 after loading kernel, but important data while not be destroyed. Speed of
 linear reading UDMA33(100) not more than 4Mbytes/s with 100% CPU usage.
 
  All HDD, MB, RAM modules different, but was tried it all possible combination.
 Version FreeBSD 6.0-CURRENT 4 month ago, now on all PC FreeBSD 6.0-CURRENT
 2weeks ago with disabled DMA.
 
  Another PC is more modern (Duron 1133/SIS735/1GBram). ata0 master WD120GB,
 ata1 master Seagate 120GB, both UDMA100. Error never ocurred.
 
 -- 
 Best regards,
  Andrey                            mailto:samspeedu at mail.ru