Messages in this thread |  | | Date | Sat, 3 Nov 2001 23:49:51 +0000 (GMT) | From | Ken Moffat <> | Subject | Re: [PATCH] driver: ide-floppy.c kernel >=2.4.7 |
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Skip,
I've just got around to testing this. I didn't have problems with the current version of ide-floppy, but I thought I'd give it a go anyway. I'm sorry to say that the performance as standard is atrocious. I was previously using 2.4.12-ac3 with the preempt patch, for these tests I tried 2.4.13-ac6. (All tests at the console, no other conscious use of the box.)
hdparm -Tt /dev/hdd1 cache disk 2.4.12-ac3-preempt 52.67Mb/s 1.06Mb/s 2.4.13-ac6+your patch 52.89Mb/S 480.43kB/s (above are worst of three, but there isn't wide variation)
time mke2fs /dev/hdd1 real user sys 2.4.12-ac3-preempt 0m4.252s 0m0.010s 0m0.090s 2.4.13-ac6+your patch 0m8.349s 0m0.000s 0m0.070s
Bonnie -s 85 -d /zip ---Sequential Output------- --Sequential Input--- Rnd Seek Char Block Rewrite Char Block /sec 2.4.12-ac3 1246K/s 1504K/s 433K/s 702K/s 958K/s 30.0 2.4.13-ac6+ 575K/s 699K/s 211K/s 347K/s 447K/s 20.9
This is on a K6/500, and with your patch the disk feels _so_ slow. I accept it can be tweaked through the /proc interface, but if this is the default behaviour, it's dreadful. I do wonder if you've got a flakey drive ? Sorry.
Ken
On Tue, 30 Oct 2001, Skip Gaede wrote:
> This patch fixes a lost interrupt problem with the Iomega ATAPI Zip 100 drive > on an Asus A7V133 board (uses South Bridge VIA VT82C686 chip). The problem > occurs when trying to format the drive using mke2fs /dev/hdx1. The patch > introduces an adjustable delay between the time the drive asserts DRQ and > deasserts BSY after issuing the packet command and before transferring the 12 > byte packet.. With delays of 3-5 ticks, the filesystem creation occurs > without retries/resets. The delay can be adjusted through the proc interface > by adjusting the value assigned to the parameter ticks. (Without the patch, I > experienced 111 lost interrupts, resulting in an elapsed time of over 2 hours > to format the drive. With the patch, mke2fs completed in <15 seconds.) > I am looking for testing, by others who have the internal Zip drive and may > have experienced the same problem, as well as comments. > > Thanks, > --Skip
-- If a six turned out to be nine, I don't mind.
Home page : http://www.kenmoffat.uklinux.net
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