Messages in this thread | | | Date | Tue, 27 Sep 2005 22:55:20 -0400 (Eastern Daylight Time) | From | Parag Warudkar <> | Subject | RE: problem with 2.6.13.[0-2] |
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> DMA is on in both 2.6.12.6 and in 2.6.13.2. Here's what hdparm > /dev/hda gives: > > in 2.6.12.6: > > /dev/hda: > multcount = 16 (on) > IO_support = 0 (default 16-bit) > unmaskirq = 0 (off) > using_dma = 1 (on) > keepsettings = 0 (off) > readonly = 0 (off) > readahead = 256 (on) > geometry = 65535/16/63, sectors = 195371568, start = 0 > > in 2.6.13.2 it's the same, except for > > multcount = 0 (off) > > Could this be the problem, and if so, would setting multcount to on > fix it? (I take it hdparm -m 16 /dev/hda would do it)
I doubt if multcount will make a difference, but you can try. Probably next best thing to do is profile the slow kernel to find where it is spending time. (pass profile=2 on kernel command line and use readprofile or use oprofile).
Did you try hdparm -tT /dev/hda? It's going to be slow, thats for sure from what you described but try that and then post dmesg (for both kernels) and profile results - may be someone will get a clue from that.
Parag
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