Re: Interrupt hick ups

"Timothy A. Seufert" wrote:

Have you made sure your HD is set up for DMA, etc.?  For example, do
"hdparm -d1 -u1 -m16 -p4 /dev/hda" and then run the -t throughput
test.  (Use the man pages to make sure those are sane options, that's
all from memory.)

I remember similar fluctuation in 2.2.x as automatic negotiation of
DMA and so forth was first put in then taken out of the IDE driver.

Also, to make sure buffers get flushed before a test (for repeatable
results) you should do hdparm -Tt, not just hdparm -t.

Yes, I did all this, except the -d1 bit which doesn't do anything on my
old drive. The numbers I gave were the maximum I could get with any kind
of tweaking.

Anyway, I am not really complaining (there are far more serious bugs in
-ac16), I guess it was just something too nice to stay for real.

--
Martin

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