Re: [2.5.2-pre3] Harddisk Performance

[Jens Axboe <axboe@suse.de>]

On Sat, Dec 29 2001, Heinz Diehl wrote:
> Hi!
> 
> Running 2.5.2-pre3, hdparm shows up very poor harddisk performance
> on my system compared to 2.4.x:
> 
> [Kernel 2.5.2-pre3]
> 
> elfie:~ # hdparm -tT /dev/hda
> 
> /dev/hda:
> Timing buffer-cache reads:   128 MB in  1.77 seconds = 72.32 MB/sec
> Timing buffered disk reads:  64 MB in 22.09 seconds =  2.90 MB/sec
>                                                        ^^^^
> [Kernel 2.4.17]
> 
> elfie:~ # hdparm -tT /dev/hda
> 
> /dev/hda:
> Timing buffer-cache reads:   128 MB in  1.81 seconds = 70.72 MB/sec
> Timing buffered disk reads:  64 MB in  6.61 seconds =  9.68 MB/sec

Yes I just noticed that too (someone else reported it) -- seems to be
due to missed merges, I'm investigating. The list corruption bug has
higher prio rigth now, though.

-- 
Jens Axboe