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kern/45034: Satalink driver downgrades from DMA to PIO 4 from soft errors (sandpoint/PowerPc)
>Synopsis: Satalink driver downgrades from DMA to PIO 4 from soft errors
>Arrival-Date: Thu Jun 09 15:00:00 +0000 2011
>Originator: Oscar Molin
>Release: NetBSD 5.99.52 (GENERIC) #0: Sun May 29 10:35:38 UTC 2011
NetBSD netcube 5.99.52 NetBSD 5.99.52 (GENERIC) #0: Sun May 29 10:35:38 UTC
When performing large file transfers (tested over NFS) onto harddrives attached
to silicon image 3512 controller, soft errors occur and causes the satalink
driver to downgrade from DMA to PIO 4 mode, causing big performance penalty.
This has been tested with all for available SATA channels (my system has
2x2-port controllers) and with different harddrives and SATA cables.
After rebooting, the harddrives function at full speed again but when large
transfers are started, soft errors occur after a short while.
No data corruption ever occurs, and the problem doesn't appear under Linux.
Transfer large file to harddrive over NFS (probably other means aswell)
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