Messages in this thread | | | From | Grant Coady <> | Subject | Re: [git patches] IDE update | Date | Fri, 08 Jul 2005 10:06:43 +1000 |
| |
On Thu, 07 Jul 2005 18:32:52 -0400, Mark Lord <liml@rtr.ca> wrote: > >hdparm can also use O_DIRECT for the -t timing test.
I've not been able to get dual channel I/O speed faster than single interface speed, either as 'md' RAID0 or simultaneous reading or writing done the other day:
Time to write or read 500MB file:
>summary 2.4.31-hf1 2.6.12.2 >boxen \ time -> w r w r >--------------- ---- ---- ---- ---- ... >peetoo 33 20 26.5 22 >(simultaneuous 57 37.5 52 38.5)
MB/s 2.4.31-hf1 2.6.12.2 w r w r single 15 25 19 23 dual 17.5 27 19 26
These timings show very little happening in parallel, is that normal?
Thanks, --Grant.
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |