Nikita V. Youshchenko wrote:
Hello.Recently I upgraded 2 boxes for self-compiled 2.4 kernel to Debian 2.6.5 kernel from sid.Now both boxes experience high CPU usage during disk I/O, which causes serious performance degradation.DMA is on.hdparm -tT shows that disk speed is the same as before upgrade - 20 mb/sec on one box, 40 mb/sec on another - that means, DMA is really enabled. However, similar to any other disk activity, while hdparm is performing it's test CPU usage is almost at 100% (in iowait state). Before upgrade, CPU was idle during test.
What is the output of `hdparm -i /dev/hda` (or whatever the device is? -Roberto Sanchez
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