Date: Thu, 15 Aug 1996 10:28:58 +1000 From: Bruce Evans <bde@zeta.org.au> To: bde@zeta.org.au, nate@mt.sri.com Cc: freebsd-hackers@freefall.freebsd.org, msmith@atrad.adelaide.edu.au, ponds!rivers@dg-rtp.dg.com, ponds!rivers@freefall.freebsd.org, sag.space.lockheed.com!handy@dg-rtp.dg.com Subject: Re: sio issues (silo overflows on a pentium, locked in ttywait, etc...) Message-ID: <199608150028.KAA11973@godzilla.zeta.org.au>
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>> Here is my throwaway lkm and auxiliarly program for testing bus hogging. >.. >> Compile and run the hogtime utility. Start processes to exercise the >> bus hog(s), e.g., `dd bs=1024k </dev/rsd0 >/dev/null'. Watch the >> output from hogtime. >For my main disk, here are typical #'s: >min = 23, av = 38, max = 58 >And for the second disk, which is an old 40M SCSI disk which is only >used for swap. >min = 23, av = 25, max = 59 >Are these #'s in ms? us. 1 ms is a long time. They are fairly large (I guess they are typical for ISA), but not a problem. Only the DMA burst timing should matter. It accumulates for multiple DMA devices. On my ASUS-P133 NCR'810 system: idle: 13, 13, 16 reading rsd0 (bs=64k) 13, 14, 19-21 reading rsd0 && active de21040 13, 14, 20-22 reading rsd0 && rfd1 13, 15, 22-24 Bruce
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