On Tue, Sep 19, 2023 at 1:13 PM Leonardo Bras wrote:
>
> On Sun, Sep 17, 2023 at 10:34:36PM +0800, Guo Ren wrote:
> > On Sat, Sep 16, 2023 at 9:25 AM Leonardo Bras wrote:
> > >
> > > On Fri, Sep 15, 2023 at 08:36:31PM +0800, Guo Ren wrote:
> > > > On Wed, Sep 13, 2023 at 4:50 PM Leonardo Bras
>
On Tue, Sep 19, 2023 at 1:30 PM Leonardo Bras wrote:
>
> On Sun, Sep 17, 2023 at 11:12:31PM +0800, Guo Ren wrote:
> > On Thu, Sep 14, 2023 at 4:02 PM Leonardo Bras wrote:
> > >
> > > On Sun, Sep 10, 2023 at 04:29:02AM -0400, guo...@kernel.org wrote:
> > > > From: Guo Ren
> > > >
> > > > Add a st
On Wed, Sep 13 2023 at 21:48, Xin Li wrote:
> +static inline void fred_syscall_init(void)
> +{
> + /*
> + * Per FRED spec 5.0, FRED uses the ring 3 FRED entrypoint for SYSCALL
> + * and SYSENTER, and ERETU is the only legit instruction to return to
> + * ring 3, as a result there
From: Xie XiuQi
The following error message is reported when running the example in document.
# timerlat hist -d 10m -c 0-4 -P d:100us:1ms -p 1ms --no-aa
Failed to set timerlat period
Could not apply config
The unit of the period is microsecond, '1ms' cannot be accepted.
usage: [rtla]
On Mon, 18 Sept 2023 at 19:39, Ingo Molnar wrote:
>
> What's the split of the increase in overhead due to SLAB_VIRTUAL=y, between
> user-space execution and kernel-space execution?
>
Same benchmark as before (compiling a kernel on a system running the patched
kernel):
Intel Skylake:
LABEL
On 9/19/23 15:30, Xie XiuQi wrote:
> From: Xie XiuQi
>
> The following error message is reported when running the example in document.
>
> # timerlat hist -d 10m -c 0-4 -P d:100us:1ms -p 1ms --no-aa
> Failed to set timerlat period
> Could not apply config
>
> The unit of the period is mic
On Tue, Sep 19, 2023 at 03:53:22PM +0800, Guo Ren wrote:
> On Tue, Sep 19, 2023 at 1:13 PM Leonardo Bras wrote:
> >
> > On Sun, Sep 17, 2023 at 10:34:36PM +0800, Guo Ren wrote:
> > > On Sat, Sep 16, 2023 at 9:25 AM Leonardo Bras wrote:
> > > >
> > > > On Fri, Sep 15, 2023 at 08:36:31PM +0800, Guo
On Tue, Sep 19, 2023 at 04:04:48PM +0800, Guo Ren wrote:
> On Tue, Sep 19, 2023 at 1:30 PM Leonardo Bras wrote:
> >
> > On Sun, Sep 17, 2023 at 11:12:31PM +0800, Guo Ren wrote:
> > > On Thu, Sep 14, 2023 at 4:02 PM Leonardo Bras wrote:
> > > >
> > > > On Sun, Sep 10, 2023 at 04:29:02AM -0400, guo
On Mon, 18 Sept 2023 at 20:05, Linus Torvalds
wrote:
>
> ... and equally importantly, what about DMA?
I'm not exactly sure what you mean by this, I don't think this should
affect the performance of DMA.
> Or what about the fixed-size slabs (aka kmalloc?) What's the point of
> "never re-use the s
On 9/19/23 06:42, Matteo Rizzo wrote:
> On Mon, 18 Sept 2023 at 19:39, Ingo Molnar wrote:
>> What's the split of the increase in overhead due to SLAB_VIRTUAL=y, between
>> user-space execution and kernel-space execution?
>>
> Same benchmark as before (compiling a kernel on a system running the pat
On 9/19/23 08:48, Matteo Rizzo wrote:
>> I think the whole "make it one single compile-time option" model is
>> completely and fundamentally broken.
> Wouldn't making this toggleable at boot time or runtime make performance
> even worse?
Maybe.
But you can tolerate even more of a performance impa
On September 19, 2023 9:02:07 AM PDT, Dave Hansen wrote:
>On 9/19/23 08:48, Matteo Rizzo wrote:
>>> I think the whole "make it one single compile-time option" model is
>>> completely and fundamentally broken.
>> Wouldn't making this toggleable at boot time or runtime make performance
>> even worse
On Tue, 19 Sept 2023 at 08:48, Matteo Rizzo wrote:
>
> On Mon, 18 Sept 2023 at 20:05, Linus Torvalds
> wrote:
> >
> > ... and equally importantly, what about DMA?
>
> I'm not exactly sure what you mean by this, I don't think this should
> affect the performance of DMA.
I was more worried about j
> > +static inline void fred_syscall_init(void) {
> > + /*
> > +* Per FRED spec 5.0, FRED uses the ring 3 FRED entrypoint for SYSCALL
> > +* and SYSENTER, and ERETU is the only legit instruction to return to
> > +* ring 3, as a result there is _no_ need to setup the SYSCALL and
> > +
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