On Fri, 2023-09-22 at 21:08 +0100, Anton Ivanov wrote:
> On 22/09/2023 20:41, Johannes Berg wrote:
> > On Fri, 2023-09-22 at 14:41 +0100, Anton Ivanov wrote:
> > >
> > > It is nearly twice slower than the current approach on a find /usr -type
> > > f -exec cat {} > /dev/null \;
> > >
> >
> > Btw, I cannot reproduce that at all - seems about the same in my tests?
> >
> > Is there anything special in your setup?
> >
> > Or maybe it's because I'm using hostfs? But not sure why that would
> > matter.
>
> I am using a ubd with ext4 sitting on an nfs server. The host, however,
> has more than enough memory to cache all of it, so it is pretty much
> like reading off a ramdisk as it is fully cached.
>
> It is quite clear in that case.
>
Did you have your preempt patch applied also, btw? Because I was working
off that now.
But even with PREEMPT turned off, I see basically no difference in such
a benchmark. I was running only over /usr/bin/ because otherwise it's
just too much time on my system overall, but there's basically no
difference in the 4x4 matrix of
- preempt off / preempt voluntary
- with / without my patch
johannes
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