via82cxxx don't use DMA on VT8237 chipset

Bug #208153 reported by Sannny on 2008-03-28

This bug report was converted into a question: question #28274: via82cxxx don't use DMA on VT8237 chipset.

Affects Status Importance Assigned to Milestone
linux (Ubuntu)

Bug Description

via82cxxx don't use DMA on VT8237 chipset (maybe others from via too).

Got the problem with a Via VB6002 mainboard running Ubuntu 8.04 Beta using a sata disk.


Hi Sannny,

Care to attach the output of "sudo lspci -vvnn" . Also, just for future reference if you could attach each log file individually rather than as a tarball it would be much appreciated. Thanks.

Changed in linux:
status: New → Incomplete
Sannny (samuel-owee) wrote :
Sannny (samuel-owee) wrote :

Oh, ehm, DMA seems to be enabled all the time. False alarm.

[ 22.057440] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[ 22.057569] USB Universal Host Controller Interface driver v3.0
[ 22.238635] ata1.00: ATA-8: WDC WD5000ABPS-01ZZB0, 02.01B01, max UDMA/133
[ 22.238646] ata1.00: 976773168 sectors, multi 16: LBA48 NCQ (depth 0/32)
[ 22.253784] ata1.00: configured for UDMA/133
[ 22.457188] ata2: SATA link down 1.5 Gbps (SStatus 0 SControl 300)
[ 22.469100] scsi 0:0:0:0: Direct-Access ATA WDC WD5000ABPS-0 02.0 PQ: 0 ANSI: 5

Now i'm wondering why the CPU iowait goes up to 80% when i copy some files around the disk... does anybody know why?

Thanks, Sannny

Changed in linux:
status: Incomplete → Invalid
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