Date: Fri, 26 Aug 2005 03:21:35 -0600 From: Anthony Chavez <acc@anthonychavez.org> To: freebsd-questions@freebsd.org Subject: Stress testing and TIMEOUT - WRITE_DMA Message-ID: <m2br3lt5nk.fsf@pegasos.local>
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--=-=-= Greetings, freebsd-questions! I've got a number of machines to deploy in very critical locations *very* soon, so I'd appreciate any expedient responses that I can get about this. I have been affected by the recent issues surrounding the recent ATA driver changes in the 5.x branch. I'm currently tracking RELENG_5_4 (FreeBSD 5.4-RELEASE-p6) on systems with ICH4 and ICH6 UDMA controllers. I recently applied Soeren's patch [1] on an ICH4 system, and put a significant write load (/usr/ports/sysutils/stress -i4 -d4) on it for almost 2 weeks. Here are the results: Aug 13 21:10:01 witproto sudo: acc : TTY=ttyp5 ; PWD=/usr/home/acc ; USER=root ; COMMAND=/usr/local/bin/stress -i 4 -d 4 Aug 19 21:31:14 witproto kernel: ad0: TIMEOUT - WRITE_DMA retrying (2 retries left) LBA=7879615 Aug 21 07:59:57 witproto kernel: ad0: TIMEOUT - WRITE_DMA retrying (2 retries left) LBA=3775775 Aug 23 23:01:41 witproto kernel: ad0: TIMEOUT - WRITE_DMA retrying (2 retries left) LBA=5560159 Aug 25 12:06:50 witproto kernel: ad0: TIMEOUT - WRITE_DMA retrying (2 retries left) LBA=5786623 FWIW, my hardware is: atapci0: <Intel ICH4 UDMA100 controller> port 0xffa0-0xffaf,0x376,0x170-0x177,0x3f6,0x1f0-0x1f7 irq 18 at device 31.1 on pci0 ad0: 76293MB <SAMSUNG SP0802N TK100-28> at ata0-master UDMA100 During the test, the drive remained in UDMA100 mode and throughput varied from 18ish to 50ish MB/s (eyeball average approx. 20-25 MB/s). System load is 0.00 0.06 0.45 after killing stress. My question is simply this: is the fact that I received 4 TIMEOUT warnings in the space of roughly 2 weeks significant cause for concern? [1] http://people.freebsd.org/~sos/ATA/ -- Anthony Chavez http://anthonychavez.org/ mailto:acc@anthonychavez.org jabber:acc@jabber.anthonychavez.org --=-=-= Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.0 (Darwin) iQEVAwUAQw7fI/AIdTFWAbdTAQqd4Af/VArw9x3D+XAHR7J7m52h6yWb2ETyj3J6 5wXGKCZ5SMzln3mLGEcKsWHGJP/OPg1p3x9PmKHFvvBTHnEapgpdeAu4D4IDMTlC v/xJEph9Quo350q7+YhB6geMbF0i5EGMBNELDdPCba8zcxotcPU3jKVKtJaiL2/X 4iChueEJIixyVaDZdliuqSBhsvy+dP+B0nuk0LTTpQVVoNkeYEN+dM0PeF8eHp2K 5bNLl0Ye8FyVkZ3a6gHq9wVAya3hhBsLyfhOtJkLauukns2dXJ0dh+QaMMyCw7Ct 8k/e/lxPzkxfspdxo34BczSLNpbu69j+2hA/KOID9QuGOgeeCntjWg== =/tBy -----END PGP SIGNATURE----- --=-=-=--
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