Messages in this thread | | | Subject | Re: [2.4] siimage locks hard on high load | From | Justin Cormack <> | Date | 10 Sep 2003 13:52:38 +0100 |
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On Fri, 2003-09-12 at 12:44, Witold Krecicki wrote: > 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?
Cant help you on the lockups (I havent seen this myself), but the performance is due to the workaround that sets max_kb_per_request to 15 for siimage. On some drives (Western digital, maxtor) this only cuts the performance by 10-15MB/s or so but on the Seagates it completely trashes performance (you can easily test this but you may get data corruption...).
A proper bug fix rather than a workaround would be nice (unless this isnt possible). Are the docs for this chipset actually available and is a bug fix possible? (Alan/Andre should know).
Justin
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