[2.4] siimage locks hard on high load

[Witold Krecicki]

I've got Asus a7n8x deluxe with on-board Silicon Image SATA and 2xBarracuda 
120GB connected to it in software RAID array.
On high disk load (e.g. cp -Rf /usr/src/linux somewhere_else) kernel locks 
hard after about 10 seconds (magic sysrq is not working).
It happens only when DMA is enabled. 
/dev/hda:
 multcount    = 16 (on)
 IO_support   =  1 (32-bit)
 unmaskirq    =  1 (on)
 using_dma    =  1 (on)
 keepsettings =  0 (off)
 readonly     =  0 (off)
 readahead    = 16 (on)
 geometry     = 14593/255/63, sectors = 234441648, start = 0

Also, I'm not really satisfied with speed of this array:
/dev/md1:
 Timing buffered disk reads:  64 MB in  1.77 seconds = 36.16 MB/sec
Any solutions/fixes?
-- 
Witold Kręcicki (adasi) adasi [at] culm.net
GPG key: 7AE20871
http://www.culm.net
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/