Messages in this thread |  | | Date | Mon, 13 Jan 2003 21:49:49 -0500 | Subject | Re: IDE DMA disabled with via82cxxx on kernels >= 2.5.35 | From | rwhron@earthlin ... |
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>> Recent 2.5 kernels boot with "DMA disabled".
> It turns it on again but forgets to tell you. Its on the fix list > but for 2.4 first
Actual throughput on Athlon is better then hdparm lets on. A dd test on 2.5.53-mm1 shows about 120 MB/sec for a file that fits in memory.
# time dd if=/dev/zero of=/tmp/junk bs=4M count=100 100+0 records in 100+0 records out
real 0m3.312s user 0m0.002s sys 0m3.267s
# ls -lh /tmp/junk -rw-r--r-- 1 root root 400M Jan 13 21:43 /tmp/junk
hdparm -tT on the K6/2 shows similar throughput between 2.4 and 2.5.
Maybe my hdparm is just wacky on 2.5.
2.4.20-pre3-jam1:
/dev/hda: Timing buffer-cache reads: 128 MB in 0.70 seconds =182.86 MB/sec Timing buffered disk reads: 64 MB in 2.07 seconds = 30.92 MB/sec
2.5.53-mm1
/dev/hda: Timing buffer-cache reads: 128 MB in 7.20 seconds = 17.78 MB/sec Timing buffered disk reads: 64 MB in 19.66 seconds = 3.26 MB/sec
-- Randy Hron http://home.earthlink.net/~rwhron/kernel/bigbox.html
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