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SubjectRe: ISSUE: (ext2fs?) disk I/O and responsivness
On Tue, 19 Oct 1999, David Ford wrote:

> Date: Tue, 19 Oct 1999 00:00:43 -0700
> From: David Ford <david@kalifornia.com>
> Reply-To: david+validemail@kalifornia.com
> To: Mattias Sandgren <mattias@leif.silicon.nu>
> Cc: linux-kernel@vger.rutgers.edu, Ronald Wahl <rwahl@gmx.net>
> Subject: Re: ISSUE: (ext2fs?) disk I/O and responsivness
>
> Let me chime in and say "me too". I have a system that responds precisely like
> this. Actually, it's not "a large file", it is "a large amount of writes".
>
> You can see this by untarring linux kernel source with -v. it _creeps_ by. If
> done immediately after boot, it's quite fast, then it slows to an intolerable crawl
> and there is -no- indication as to _why_ it's slow. At first I thought it might be
> because I compiled it SMP, nope, that isn't a fix. Next I swapped from adaptec
> 2940 to a symbios card. Nope, that didn't have any affect either.
>
> Here's a kicker. IDE is still fast. I can zip through an IDE disk like no
> tomorrow. Even when the scsi drive is slogging, the IDE drive is a wee bit faster
> (but terribly slow due to the entire system being killed). Even gpm movements are
> jerky and that's scary. X...forget about it. Takes 90 seconds to move 1/2 across
> the screen, it's easier to close your eyes and calculate the correct mouse motion
> to get where you want to go.
>
> And no. Absolutely no load shows on the machine, no kernel messages, no NOTHING
> which gives the slightest clue what's wrong.
>
> -d
[...]
Well, I have recently changed machine at work from Compaq DeskPro 5100 to
Compaq DeskPro EN 6450 and OS from RedHat Linux 4.2 to RedHat Linux 6.0;
Both systems are IDE, but with PD-CD connected to BusLogic SCSI;
While my previous system behaved normal when writing to PD, the new one
was completely unusable during write (I was not even able to switch
between screens on X);
Then I went to BIOS settings and changed PCI Busmastering enable
option from default NO to YES (and also disabled serial 2, so I had a
separate IRQ for SCSI card); After this change the system work quite well
during transfers to PD.

I am not sure how much relevant it is to your problems, but as symptoms
were similar, I thought I would post this.

Best regards,

Wojtek



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