Re: Random file I/O regressions in 2.6

[Andrew Morton]

Ram Pai <linuxram@xxxxxxxxxx> wrote:
>
> I ran the following command:
> 
>  /root/sysbench-0.2.5/sysbench/sysbench --num-threads=256 --test=fileio
>  --file-total-size=2800M --file-test-mode=rndrw run 
> 

Alexey and I have been using 16 threads.

You don't tell us how much memory your lab machine has.  The above command
only makes sense if it is less than 400 megabytes.  Otherwise many or all
of the reads are satisfied from pagecache.

I've been testing with mem=256M, --file-total-size=2G.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/