Messages in this thread | | | Date | Wed, 22 Jun 2005 13:15:36 -0700 | Subject | Re: PREEMPT_RT vs I-PIPE: the numbers, part 2 | From | Bill Huey (hui) <> |
| |
On Wed, Jun 22, 2005 at 04:10:57PM -0400, Karim Yaghmour wrote: > Bill Huey (hui) wrote: > > FreeBSD went through some slow down when they moved to SMPng, but not > > the kind of numbers you show for things surrounding the network stack. > > Something clearly bad happened. > > Note that the numbers are not freak accidents, they are consistent > accross the various setups. So in total, that's 15 LMbench runs, > all showing consistent _severe_ cost for preempt_rt. And this despite
Yeah, I looked at the numbers more carefully and it's clearly showing some problems. There is a significant context switch penalty with irq-threads and I wouldn't surprise if this is what's going on.
bill
- 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/
| |