Messages in this thread | | | From | Andrew Morton <> | Subject | Re: IDE DMA disabled with via82cxxx on kernels >= 2.5.35 | Date | Mon, 13 Jan 2003 19:47:08 -0800 |
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On Mon January 13 2003 18:49, rwhron@earthlink.net wrote: > > 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
2.5.53-mm1 had a dud patch in it which made part of the kernel think HZ=100, other parts think HZ=1000, depending on whether the .c file happened to include config.h before including param.h.
Hence your nice 10x discrepancy.
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