From mboxrd@z Thu Jan 1 00:00:00 1970 Message-Id: <200007251835.TAA17680@hyperion.valhalla.net> Date: Tue, 25 Jul 2000 19:29:51 +0100 Subject: Re: [ANN] IRQ Latency tool 0.1.3 release. From: "Iain Sandoe" To: Geert Uytterhoeven CC: linuxppc-dev@lists.linuxppc.org, jsun@mvista.com Mime-version: 1.0 Content-type: text/plain; charset="US-ASCII" Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: On Tue, Jul 25, 2000, Geert Uytterhoeven wrote: > On Mon, 24 Jul 2000, Iain Sandoe wrote: [...] >> I still haven't found the "hard-block" that is effecting the overall audio >> latency performance... ah well, back to the drawing board... > > Do you have IDE? The IDE driver turned out to be the major interrupt messing > problem on m68k, since it can disable interrupts for quite a while. I do, but the audio latency test (which is what promoted this interest in doing the IRQ measurement) doesn't stress the IDE (I only have a CDROM on the IDE bus). All the disk activity is via the AppleSCSI card. However, I would like others with different configurations to try out the test(s)... it's not much use if acceptable performance sound only happens on *my* machine :-) It's also true that all the 'little' IRQ blocks do add up - as I said when my system is stressed up to 5% of the total elapsed time can be blocked... a good motivation for driver writers to tune things methinks... Iain. ** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/