Low HDD tranfer rate with FreeBSD 5.3-Release

WMC wc_fbsd at xxiii.com
Mon May 9 13:08:46 PDT 2005


At 03:50 PM 5/9/2005, you wrote:
> > So how does the block size makes the difference?? What is the 
> true  transfer rate.?

FWIW, there's a nice little disk IO benchmark "Bonnie" available in the 
ports & packages.  Tests several variations of sequential and random IO.  I 
don't know how accurate its numbers in absolute terms, but it's at least 
good for relative comparisons of devices on similar systems.  Be sure to 
use the -s option to increase the test file size to something larger than 
your ram.

Sample Output:

/datatel > bonnie -s 1000
File './Bonnie.709', size: 1048576000
Writing with putc()...done
Rewriting...done
Writing intelligently...done
Reading with getc()...done
Reading intelligently...done
Seeker 1...Seeker 3...Seeker 2...start 'em...done...done...done...
               -------Sequential Output-------- ---Sequential Input-- 
--Random--
               -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- 
--Seeks---
Machine    MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU  /sec %CPU
          1000 10835 98.5 26996 18.1 19876 15.2  8925 83.6 62490 23.0 
325.9  3.3



  -Wayne


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