lkml.org 
[lkml]   [2001]   [Apr]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectIDE DMA under 2.4?
From
Date

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
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:25    [W:3.223 / U:0.008 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site