From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <394A6392.4C9FAAA0@wanadoo.fr> Date: Fri, 16 Jun 2000 19:27:46 +0200 From: Martin Costabel MIME-Version: 1.0 To: "Timothy A. Seufert" CC: Linux/PPC Development Subject: Re: Interrupt hick ups References: <3949DDBD.331E255F@wanadoo.fr> Content-Type: text/plain; charset=us-ascii Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: "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 ** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/