Date: Fri, 7 Oct 2005 09:45:20 +0200 From: Stijn Hoop <stijn@win.tue.nl> To: freebsd-current@freebsd.org Subject: Re: interrupt throttling stepping in too soon? Message-ID: <20051007074520.GS86136@pcwin002.win.tue.nl> In-Reply-To: <20051006075312.GM86136@pcwin002.win.tue.nl> References: <20051006075312.GM86136@pcwin002.win.tue.nl>
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--uZ3hkaAS1mZxFaxD Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Followup to my own problem: On Thu, Oct 06, 2005 at 09:53:12AM +0200, Stijn Hoop wrote: > On the console there were multiple DMA_TIMEOUT messages for the disks of > the array, and just above those was a line about an 'interrupt storm for > atapci0, throttling'. After a rebuild which completed succesfully, I rsynced data to the disks. About 5 minutes later the same message appeared and the machine panic'd, this time destroying /var/log with it :-/ Anyway, I decided to hammer the disks without waiting a long time for gvinu= m=20 to build an array, and indeed I can reproduce this by mounting all 4 drives, and for each drive dd'ing the whole drive to /dev/null plus rsync'ing data to it at the same time. It held up at 20 MB/s but I suspect that the box isn't keeping up with the combined total of interrupts because it goes down faster when I engage the network (rsync from a remote box). So, I guess my question becomes: is there a way to find out why this box can't handle enough interrupts? Could it be that the motherboard is flawed? Is this definitely a hardware error or is it still possible that the interrupt throttling is stepping in too soon and thus screwing the rest of the system? On a sidenote, I monitored systat -vmstat while doing the above and it appeared that IRQ 11 (ATA controller) was doing around 1000-1100 irqs/s, and IRQ 5 (xl0) was doing around 800-1000 irqs/s. Is there a way to log this somehow? *grumbling-something-about-i386-hardware*'ingly yours, --Stijn --=20 "Linux has many different distributions, meaning that you can probably find one that is exactly what you want (I even found one that looked like a Unix system)." -- Mike Meyer, from a posting at questions@freebsd.org --uZ3hkaAS1mZxFaxD Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (FreeBSD) iD8DBQFDRieQY3r/tLQmfWcRAqo4AJ0egIFihSul58257FRND/cQ/UoKOACeOv77 6JPqJKzNE0YmOfGSILUTCdw= =PBFG -----END PGP SIGNATURE----- --uZ3hkaAS1mZxFaxD--
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