Re: freebsd vs linux: performance problem

sounds like a power unit problem. try to switch them and
repeat.

----- Original Message ----
From: Shantanu Ghosh <shantanu_ghoshyahoo.com>
To: freebsd-performancefreebsd.org
Sent: Thursday, December 13, 2007 2:07:50 PM
Subject: freebsd vs linux: performance problem


Hi,

I am running FreeBSD 7.0 Beta1 and Linux FC6 on two
identical pieces of
hardware - Dell poweredge with intel core2 duo. Each system
has 4 CPUs.

Now, in simple memory access operations, I see the freebsd
system being
noticably slower than the linux system. A simple C program
that copies
from one memory buffer to another, when executed in a loop
executes
between 10-30% slower on freebsd, as compared to linux. The
assembly
code of the program used for testing is identical in both
the cases.

One observation is that freebsd system performance decreases
as the
size of the buffer increases. If the buffer is under 1k,
both the
sytems give the same performance. freebsd performance is
about 10%
slower if the buffer size is around 4k, and about 30% slower
if the
buffer is around 1Mb. A benchmark like sysbench memory read
operation
performs miserably on the freebsd system, compared to
linux.

As far as I can see, the BIOS settings are identical on both
the
machines. Any idea what could be going on?

Thanks and regards.
--
Shantanu.


    
 
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Hi,

Nash Nipples wrote:
> sounds like a power unit problem. try to switch them
and repeat.

hey, in the next step you tell him that the MTU is set
wrongly.
> 
> 
> Now, in simple memory access operations, I see the
freebsd system being
> noticably slower than the linux system. A simple C
program that copies

As already mentioned, are both systems working as 32 or 64
bit systems?

> from one memory buffer to another, when executed in a
loop executes
> between 10-30% slower on freebsd, as compared to linux.
The assembly
> code of the program used for testing is identical in
both the cases.

Don't you call memcpy?

Erich
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