Re: ia_64_bit Performance difference

[Gerhard Mack <gmack@innerfire.net>]

On Tue, 27 Dec 2005, Nauman Tahir wrote:
> On 12/27/05, Arjan van de Ven <arjan@infradead.org> wrote:
> > On Tue, 2005-12-27 at 12:18 +0500, Nauman Tahir wrote:
> > > Hi all,
> > > I have written a block device driver. Driver includes the
> > > implementation of write back cache policy. Purpose of the driver is
> > > not an issue. The problem I am facing is the considerable difference
> > > of performance when I run same driver on 32 and 64 BIT OS. I am
> > > testing the driver on 64 Bit Machine and run the same driver on both
> > > (32 and 64 Bit) OS. On 32 Bit, IO rate is almost double then on 64 Bit
> > > OS. ( i wish it could have been opposite :( )
> >
> > you forgot to post the URL to your source code...
> 
> I did NOT FORGET to post the URL of my code as I mentioned I am
> interested in general
> areas of the kernel to look for. Like is there any problem related to
> 64 bit specific kernel compilation etc...
> 
> You should ask for my system configurations. As far as the code is
> concered there is not any architecture specific issue I guess in that.
> I have used threads of MD as my generic thread library and have used
> calculations based on unsigned long.
> 
> Kernel Version:
> I am using is 2.6.9 and onwards.
> 
> Machine configuration is :
> HP Prolient DL 145 (Dual Opteron 244 Processors with 14GB RAM)

Opteron is not ia_64 it's X86_64.  ia_64 is Itanuim.

	Gerhard




--
Gerhard Mack

gmack@innerfire.net

<>< As a computer I find your faith in technology amusing.