IDE DMA under 2.4?

From: Ian Soboroff (ian@cs.umbc.edu)
Date: Thu Apr 12 2001 - 10:16:47 EST

Next message: Cyrille Ngalle: "RE: kernel crash"
Previous message: Alexander Viro: "Re: [PATCH] Re: memory usage - dentry_cacheg"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

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/

Next message: Cyrille Ngalle: "RE: kernel crash"
Previous message: Alexander Viro: "Re: [PATCH] Re: memory usage - dentry_cacheg"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

This archive was generated by hypermail 2b29 : Sun Apr 15 2001 - 21:00:18 EST