Re: Performance drop in Linux 2.4.19-XFS 1.2 ?

[Seth Mos <knuffie@xxxxxxxxx>]

At 18:31 29-7-2003 -0700, Ravi Wijayaratne wrote:
> Hi,
>
> We are seeing a %15 performance drop when we move from XFS 1.1 to 1.2.
> Here are some of our particulars:
> We have been testing the performance of Linux-2.4.19 and XFS 1.2 with 
> NetBench.
> We compared the performance with that of Linux-2.4.18 and XFS 1.1.
> We have been running Samba 3.0.

The only problem I know of which is not exclusive to XFS (ext3 does this as 
well) is one on the read performance of 2.4.18 vs the 2.4.20 errata kernel.

On 2.4.18-27 I get 170MB/sec read speed
on 2.4.20-18 I get 80MB/sec read speed.

the write speed stays consistent between these releases but the enormous 
drop in read speed is very strange. It appears to be present in the 
standard rh errata as well.

The hardware I am seeing this on is a Dual Xeon 3.06 with 2GB ram and a 
200GB raid 10 container using 6 73GB 15K rpm disks on a Perc4/Di (lsil 
U320-2X).

The other box I replicated this on is a Single P3 733 with 768MB ram and a 
350GB raid 10 container using 6 120GB 7k2 rpm ide disks on a 3ware 7500-8.

Cheers

--
Seth
It might just be your lucky day, if you only knew.