"O. Hartmann" <ohart...@zedat.fu-berlin.de> writes:
> Am Thu, 17 Sep 2015 19:00:15 +0200
> Jean-Sébastien Pédron <dumbb...@freebsd.org> schrieb:
>
>> Hi everyone!
>>
>> I'm very sorry I didn't communicate at all on the i915 update project.
>>
>> So here is a status update: since this morning, the driver builds fine.
>> I'm currently attending the XDC (X.Org Developers Conference) and don't
>> have an Intel laptop to test with me. However, Johannes Dieterich (also
>> attending the conference) offerred his help, so we will do that today.
>>
>> Obviously, do not expect something stable in the coming couple days.
>> Thank you for your patience :)
>>
>> To answer various questions in this thread:
>>
>> Why does it take so much time to update? Once Konstantin committed his
>> i915 update, I was busy with non-FreeBSD activities until last July,
>> when I slowly started back to work on i915. My goal is to reduce the
>> diff with Linux as much as possible. But, as opposed to OpenBSD and
>> DragonFlyBSD, we do not use a Linux compatibility layer which would
>> dramatically ease our life.
>
> My concerns are speed and performance. Isn't any kind of layer consuming
> performance -
> sometimes worse, sometimes negligible. But anyway, HPC isn't a FreeBSD
> domain, so ...
Look at the linux spinlock layer in ofed/include/linux/spinlock.h
#define spin_lock(_l) mtx_lock(&(_l)->m)
#define spin_unlock(_l) mtx_unlock(&(_l)->m)
#define spin_trylock(_l) mtx_trylock(&(_l)->m)
means, that using spinlock linux layer does not have any performance
impact. I haven't read all ofed code, but most of that is just bunch of
macros and renaming stuff to use linux code without changes and no
performance impact.
--
Nikola
_______________________________________________
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"
