* cpu
@ 2005-05-28 22:25 Raz Ben-Jehuda(caro)
2005-05-29 19:52 ` cpu Michael Tokarev
0 siblings, 1 reply; 2+ messages in thread
From: Raz Ben-Jehuda(caro) @ 2005-05-28 22:25 UTC (permalink / raw)
To: linux-raid
I was testing linux raid for sometime, I created several test units
which send read request to the raid using big buffers( 4MB).
It seems to be that the software raid consumes to much cpu. I reach
100% cpu usage just by reading from the raid.
I used 4 disks raid 0.
--
Raz
Long Live the Penguin
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: cpu
2005-05-28 22:25 cpu Raz Ben-Jehuda(caro)
@ 2005-05-29 19:52 ` Michael Tokarev
0 siblings, 0 replies; 2+ messages in thread
From: Michael Tokarev @ 2005-05-29 19:52 UTC (permalink / raw)
To: Raz Ben-Jehuda(caro); +Cc: linux-raid
Raz Ben-Jehuda(caro) wrote:
> I was testing linux raid for sometime, I created several test units
> which send read request to the raid using big buffers( 4MB).
> It seems to be that the software raid consumes to much cpu. I reach
> 100% cpu usage just by reading from the raid.
> I used 4 disks raid 0.
Now try to do the same test without raid - I bet it will use
as much CPU as your raid test. Raid0 requires almost no CPU
resources, unlike improperly set up IDE disks (no DMA is the
first thing to check -- hdparm is your friend).
/mjt
^ permalink raw reply [flat|nested] 2+ messages in thread
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