Re: devdmatch: Can't read linker file.

[Warner Losh]

Makes sense. I'd forgotten that kldxref can't do cross-platform stuff
One could arrange to build it targeting arch X but running on the native
host and fix things that way. Nobody has care enough to do that, though
perhaps this gives us a use case for why one might want to try.

Warner

On Tue, Mar 13, 2018 at 11:41 AM, Daniel Braniss 
wrote:

>
>
> On 13 Mar 2018, at 19:12, Edward Napierala  wrote:
>
> I think it's only needed for kernels that are cross-built.  That's due to
> kldxref(8) being unable to handle kernels for other architectures.
>
> my case exactly.
>
> 2018-03-13 13:34 GMT+00:00 Warner Losh :
>
>> I wonder why that isn't the default, or why the linker.hints isn't at
>> least
>> created by the make installkernel step...
>>
>> Warner
>>
>> On Tue, Mar 13, 2018 at 2:40 AM, Edward Tomasz Napierała <
>> tr...@freebsd.org>
>> wrote:
>>
>> > FWIW, it seems to be a common problem, see https://reviews.freebsd.org/
>> > D14534.
>> >
>> > On 0312T1027, Warner Losh wrote:
>> > > Well, is there a /boot/kernel/linker.hints?
>> > >
>> > > Warner
>> > >
>> > > On Mon, Mar 12, 2018 at 9:56 AM, Daniel Braniss 
>> > wrote:
>> > >
>> > > > Hi,
>> > > > the above i get on arm/nanopi-neo. (it’s the only platform I run
>> > current
>> > > > :-)
>> > > >
>> > > > cheers,
>> > > > danny
>> > > >
>> > > >
>> > > ___
>> > > freebsd-current@freebsd.org mailing list
>> > > https://lists.freebsd.org/mailman/listinfo/freebsd-current
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>> > freebsd.org"
>> >
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>>
>
>
>
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Re: devdmatch: Can't read linker file.

[Daniel Braniss]

> On 13 Mar 2018, at 19:12, Edward Napierala  wrote:
> 
> I think it's only needed for kernels that are cross-built.  That's due to
> kldxref(8) being unable to handle kernels for other architectures.
> 
my case exactly.

> 2018-03-13 13:34 GMT+00:00 Warner Losh  >:
> I wonder why that isn't the default, or why the linker.hints isn't at least
> created by the make installkernel step...
> 
> Warner
> 
> On Tue, Mar 13, 2018 at 2:40 AM, Edward Tomasz Napierała  >
> wrote:
> 
> > FWIW, it seems to be a common problem, see https://reviews.freebsd.org/ 
> > 
> > D14534.
> >
> > On 0312T1027, Warner Losh wrote:
> > > Well, is there a /boot/kernel/linker.hints?
> > >
> > > Warner
> > >
> > > On Mon, Mar 12, 2018 at 9:56 AM, Daniel Braniss  > > >
> > wrote:
> > >
> > > > Hi,
> > > > the above i get on arm/nanopi-neo. (it’s the only platform I run
> > current
> > > > :-)
> > > >
> > > > cheers,
> > > > danny
> > > >
> > > >
> > > ___
> > > freebsd-current@freebsd.org  mailing 
> > > list
> > > https://lists.freebsd.org/mailman/listinfo/freebsd-current 
> > > 
> > > To unsubscribe, send any mail to "freebsd-current-unsubscribe@
> > freebsd.org "
> >
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> 
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> 

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Re: devdmatch: Can't read linker file.

[Edward Napierala]

I think it's only needed for kernels that are cross-built.  That's due to
kldxref(8) being unable to handle kernels for other architectures.

2018-03-13 13:34 GMT+00:00 Warner Losh :

> I wonder why that isn't the default, or why the linker.hints isn't at least
> created by the make installkernel step...
>
> Warner
>
> On Tue, Mar 13, 2018 at 2:40 AM, Edward Tomasz Napierała <
> tr...@freebsd.org>
> wrote:
>
> > FWIW, it seems to be a common problem, see https://reviews.freebsd.org/
> > D14534.
> >
> > On 0312T1027, Warner Losh wrote:
> > > Well, is there a /boot/kernel/linker.hints?
> > >
> > > Warner
> > >
> > > On Mon, Mar 12, 2018 at 9:56 AM, Daniel Braniss 
> > wrote:
> > >
> > > > Hi,
> > > > the above i get on arm/nanopi-neo. (it’s the only platform I run
> > current
> > > > :-)
> > > >
> > > > cheers,
> > > > danny
> > > >
> > > >
> > > ___
> > > freebsd-current@freebsd.org mailing list
> > > https://lists.freebsd.org/mailman/listinfo/freebsd-current
> > > To unsubscribe, send any mail to "freebsd-current-unsubscribe@
> > freebsd.org"
> >
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Re: Performance Benchmark for PTI (aka Meltdown mitigation)

[Slawa Olhovchenkov]

On Mon, Mar 12, 2018 at 04:36:05PM -0400, Arshan Khanifar wrote:

> I did some benchmarking for the two revisions:
> results are here:
> https://github.com/ArshanKhanifar/pti-benchmark/tree/master/stable-11-pre-after/results
> first file is before pti patch and second file is after pti patch.

10x!

.2 is is before pti patch and .4 is after pti patch?
This is like pti patch (w/ pti off) do small speed up (about 1%)?

> On Fri, Mar 9, 2018 at 10:16 AM, Slawa Olhovchenkov  wrote:
> 
> > On Fri, Mar 09, 2018 at 09:58:55AM -0500, Ed Maste wrote:
> >
> > > On 9 March 2018 at 07:01, Slawa Olhovchenkov  wrote:
> > > > On Thu, Mar 08, 2018 at 05:04:11PM -0500, Arshan Khanifar wrote:
> > > >
> > > >> Executive Summary:
> > > >> - The PTI feature increases the system call times by more than 100%.
> > > >> - As a macrobenchmark, buildworld was used. Wall clock and user time
> > > >> showed no statistically-significant changes, while system time
> > > >> increased by less than 5%.
> > > >>
> > > >> This email contains the results for benchmarking the performance of
> > the
> > > >> PTI patch on FreeBSD 12-current. As a microbenchmark, timing of
> > > >> getppid(2) system call was used, and as a macrobenchmark, a number of
> > > >> buildworld tasks were timed.
> > > >>
> > > >
> > > > Can you also run pre-patched kernel?
> > >
> > > It's not easy to do an apples-to-apples comparison as there were a few
> > > followup changes to the PTI work, interspersed with unrelated changes.
> > > That said, I think Arshan has some benchmarks obtained during the
> > > development of the PTI changes that may be illustrative.
> > >
> > > The best approach is probably to compare stable/11 at r329450 (last
> > > stable/11 revision before the merge) with r329462 with PTI and IBRS
> > > disabled.
> >
> > Stable/11 more interesting to me, nice to see.
> >
> >
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Re: devdmatch: Can't read linker file.

[Warner Losh]

I wonder why that isn't the default, or why the linker.hints isn't at least
created by the make installkernel step...

Warner

On Tue, Mar 13, 2018 at 2:40 AM, Edward Tomasz Napierała 
wrote:

> FWIW, it seems to be a common problem, see https://reviews.freebsd.org/
> D14534.
>
> On 0312T1027, Warner Losh wrote:
> > Well, is there a /boot/kernel/linker.hints?
> >
> > Warner
> >
> > On Mon, Mar 12, 2018 at 9:56 AM, Daniel Braniss 
> wrote:
> >
> > > Hi,
> > > the above i get on arm/nanopi-neo. (it’s the only platform I run
> current
> > > :-)
> > >
> > > cheers,
> > > danny
> > >
> > >
> > ___
> > freebsd-current@freebsd.org mailing list
> > https://lists.freebsd.org/mailman/listinfo/freebsd-current
> > To unsubscribe, send any mail to "freebsd-current-unsubscribe@
> freebsd.org"
>
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Re: devdmatch: Can't read linker file.

[Edward Tomasz Napierała]

FWIW, it seems to be a common problem, see https://reviews.freebsd.org/D14534.

On 0312T1027, Warner Losh wrote:
> Well, is there a /boot/kernel/linker.hints?
> 
> Warner
> 
> On Mon, Mar 12, 2018 at 9:56 AM, Daniel Braniss  wrote:
> 
> > Hi,
> > the above i get on arm/nanopi-neo. (it’s the only platform I run current
> > :-)
> >
> > cheers,
> > danny
> >
> >
> ___
> freebsd-current@freebsd.org mailing list
> https://lists.freebsd.org/mailman/listinfo/freebsd-current
> To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"
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