Date: Thu, 20 Apr 2000 12:05:21 -0700 From: Kent Stewart <kstewart@3-cities.com> To: Arcady Genkin <a.genkin@utoronto.ca> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: Selectively enable/disable DMA for an ata driver Message-ID: <38FF54F1.F6CC270C@3-cities.com> References: <87og74d9j6.fsf@tea.thpoon.com>
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Do a "man ata" and in the middle is a section on the sysctl options that you can use to set ad0 to PCI. You now have a /etc/sysctl.conf for saving options such as this one. Kent Arcady Genkin wrote: > > I have two HD: one supports DMA, the other doesn't. When I was running > 3.4, I used to selectively turn on such features for each drive with > flags. Now it seems like there is only "options ATA_ENABLE_ATAPI_IDE", > which is global. > > How would I work around that? > > ,----[ Currently I have ] > | device ata0 at isa? port IO_WD1 irq 14 > | device ata1 at isa? port IO_WD2 irq 15 > | device ata > | device atadisk > | options ATA_STATIC_ID #Static device numbering > | options ATA_ENABLE_ATAPI_DMA > `---- > ,----[ I used to have ] > | controller wdc0 at isa? port "IO_WD1" bio irq 14 flags 0x90ff90ff > | disk wd0 at wdc0 drive 0 > | controller wdc1 at isa? port "IO_WD2" bio irq 15 flags 0xb0ffb0ff > | disk wd2 at wdc1 drive 0 > `---- > > It seems like both drives are initialized in DMA mode: > ,----[ dmesg ] > | ad0: 2014MB <WDC AC22100H> [4092/16/63] at ata0-master using WDMA2 > | ad2: 18366MB <QUANTUM BIGFOOT TS19.2A> [37317/16/63] at ata1-master using WDMA2 > `---- > > I know for sure that ad0 does not support DMA, and has a habbit of > slowing down considerably if used with DMA (I remember from the time > when I experimented with different flags for the `wdc' driver). > > Thanks for any insight! > -- > Arcady Genkin http://www.thpoon.com > Nostalgia isn't what it used to be. > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-questions" in the body of the message -- Kent Stewart Richland, WA mailto:kstewart@3-cities.com http://www.3-cities.com/~kstewart/index.html FreeBSD News http://daily.daemonnews.org/ SETI(Search for Extraterrestrial Intelligence) @ HOME http://setiathome.ssl.berkeley.edu/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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