On 5/26/07, Tommy Vercetti <[EMAIL PROTECTED]> wrote:
I was trying to get answer to my question around, but no one knows. I do have DMA turned on, etc, yet - on extensive harddrive operations wait
You may have DMA turned on, but it may be ineffectual if you don't have the right IDE driver handing your disk.
time is 90+% , which means that machine is waiting, rather than doing something meanwhile. (I guess).
What does hdparm -tT /dev/hda say? If the numbers are reasonable (~400MB/s for cache reads, ~25MB/s for buffered disk reads), then you're just doing a lot of seeking on the drive, and that takes a long time. (Drives can seek about 100 times a second. If every seek reads only 4k of data, that's 400k of data processed per second, or a lot of time spent with the CPU waiting on I/O.) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
