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From: Ian Soboroff <ian@cs.umbc.edu>
To: linux-kernel@vger.kernel.org
Subject: IDE DMA under 2.4?
Date: 12 Apr 2001 11:16:47 -0400	[thread overview]
Message-ID: <87itkaup0g.fsf@danube.cs.umbc.edu> (raw)


i've noticed that i can't seem to enable DMA on my IDE disk under
2.4.2-ac18.  this works under 2.2.19pre14 (the last 2.2 kernel i
built).  i've been slogging through lk archives but can't seem to find
where this got changed.

when i do 'hdparm -d 1 /dev/hda', i get
/dev/hda:
 setting using_dma to 1 (on)
 HDIO_SET_DMA failed: Operation not permitted
 using_dma    =  0 (off)

my controller is a PIIX4, the disk is an IBM DJSA-220 (2.5" laptop
drive, 20GB).

is there any way to reenable DMA on this disk?  according to 'hdparm
-t -T' while booted single-user, i get about 6MB/s without DMA (under
2.4), and about 17MB/s with (under 2.2).

tia, and sorry if it's a faq i couldn't dig up,
ian

-- 
----
Ian Soboroff                                       ian@cs.umbc.edu
University of MD Baltimore County      http://www.cs.umbc.edu/~ian

                 reply	other threads:[~2001-04-12 15:17 UTC|newest]

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