Messages in this thread | | | Date | Wed, 16 Apr 2003 05:45:20 -0400 | From | Chuck Ebbert <> | Subject | Re: DMA transfers in 2.5.67 |
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> Btw, I just noticed that hard disk throughput is much lower with 2.5 > than 2.4. With 2.4.21-pre5 I get ~40 MB/s, but with 2.5.67 the speed > drops to 25-30 MB/s. Everything according to hdparm. Is it possible > that DMA is generally slow for some reason?
I am seeing that too, with IDE hardware.
And 2.4.20aa1 is even faster:
# mount /ext3_fs # time dd if=/ext3_fs/100MiB_file of=/dev/null bs=32k
2.4.20aa1 : 3.3 sec (exactly what I expect to see) 2.5.66 : 6.6 sec
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