Date: Fri, 01 Feb 2002 11:47:07 +0100 From: Matthias Andree <ma@dt.e-technik.uni-dortmund.de> To: freebsd-stable@freebsd.org Subject: 4.4/4.5-STABLE and ATA tags? Message-ID: <m3sn8lo4wk.fsf@emma1.emma.line.org>
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Hi, I have some observations with respect to ATA tagged queueing. Configuration: VIA VT82C686 (KT133) --- <WDC AC420400D> (only drive) Promise PDC20265(R) onboard --- <IBM-DTLA-307045> /boot/loader.conf contains hw.ata.tags="1" Neither drive is tried tagged command queueing on, either is reported with 1 queue depth. Reading ata-disk.c history in cvsweb and the source itself, I understand that: * the WDC AC420400D is not whitelisted for ATA tags, however Linux' hdparm v4.6 reports tagged queueing as supported on that drive (which is not exactly a surprise as the DPTA is older than the DJNA and the DPTA already does DMA). * the IBM-DTLA does not use tagged queueing because the controller, a Promise PDC20265R (ID: 0x0d30105a), is blacklisted. Is there any workaround possible around the Promise 20265 lock-up bugs with tagged queueing? Does the chip need to "support" queueing after all? (In the meanwhile, I'll hack up 4.5-STABLE's ad_tagsupported and see if tagged queueing on the WDC eats my data.) -- Matthias Andree "They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." Benjamin Franklin To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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