Messages in this thread | ![/](/images/icornerl.gif) | | Date | Tue, 12 Dec 2006 12:30:09 -0500 | From | Stephen Clark <> | Subject | Re: libata and sata? |
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John Richard Moser wrote:
>-----BEGIN PGP SIGNED MESSAGE----- >Hash: SHA1 > >A while back my distro moved to libata for sata_via. I was since >confused; my disk seemed a lot slower, and it looked like DMA was off. >I'm not sure how SATA works; is it even possible to enable/disable >32-bit IO and DMA? Or are those just on? > >sata_via 11524 4 >libata 112660 3 ata_generic,pata_via,sata_via > >~$ sudo hdparm -d1 -c1 -u1 /dev/sda > >/dev/sda: > setting 32-bit IO_support flag to 1 > HDIO_SET_32BIT failed: Invalid argument > setting unmaskirq to 1 (on) > HDIO_SET_UNMASKINTR failed: Inappropriate ioctl for device > setting using_dma to 1 (on) > HDIO_SET_DMA failed: Inappropriate ioctl for device > IO_support = 0 (default 16-bit) > >I no longer have two kernels to test through; I can't tell if the speed >is back or not. Nothing in dmesg tells me if SATA is using DMA or >32-bit IO support though, so I don't know... lack of knowledge over here >is killing me for troubleshooting this on my own. > > > <snip>
Hi John,
This happened to me with my ICH7 intel chipset which supports sata and ata - my drive was an ide and the performance was like 1.2mb/sec. Someone said boot with combined_mode=libata and it fixed the problem. Now I get 44mb/sec.
HTH, Steve --
"They that give up essential liberty to obtain temporary safety, deserve neither liberty nor safety." (Ben Franklin)
"The course of history shows that as a government grows, liberty decreases." (Thomas Jefferson)
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