Re: RCU latency regression in 2.6.16-rc1
- From: Lee Revell <rlrevell@xxxxxxxxxxx>
- Date: Tue, 24 Jan 2006 03:03:53 -0500
On Tue, 2006-01-24 at 09:01 +0100, Ingo Molnar wrote:
> * Lee Revell <rlrevell@xxxxxxxxxxx> wrote:
>
> > On Tue, 2006-01-24 at 08:56 +0100, Ingo Molnar wrote:
> > > * Lee Revell <rlrevell@xxxxxxxxxxx> wrote:
> > >
> > > > I ported the latency tracer to 2.6.16 and got this 13ms latency within
> > > > a few hours. This is a regression from 2.6.15.
> > > >
> > > > It appears that RCU can invoke ipv4_dst_destroy thousands of times in
> > > > a single batch.
> > >
> > > could you try the PREEMPT_RCU patch below?
> >
> > Sure. If it works do you see this making it in 2.6.16? Otherwise we
> > still would have a regression...
>
> nope, that likely wont make v2.6.16, which is frozen already.
>
Well, the last latency regression I found, I was told "I wish you'd
caught this at 2.6.15-rc1, something could have been done". Now I've
found another one at the -rc1 stage, and there's still nothing that can
be done?
Lee
-
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/
- Follow-Ups:
- Re: RCU latency regression in 2.6.16-rc1
- From: Ingo Molnar
- Re: RCU latency regression in 2.6.16-rc1
- References:
- RCU latency regression in 2.6.16-rc1
- From: Lee Revell
- Re: RCU latency regression in 2.6.16-rc1
- From: Ingo Molnar
- Re: RCU latency regression in 2.6.16-rc1
- From: Lee Revell
- Re: RCU latency regression in 2.6.16-rc1
- From: Ingo Molnar
- RCU latency regression in 2.6.16-rc1
- Prev by Date: Re: RCU latency regression in 2.6.16-rc1
- Next by Date: Re: RCU latency regression in 2.6.16-rc1
- Previous by thread: Re: RCU latency regression in 2.6.16-rc1
- Next by thread: Re: RCU latency regression in 2.6.16-rc1
- Index(es):
Relevant Pages
|
