Re: 13.0 RC4 might be delayed

On Sunday, 28 March 2021 20:37:13 CDT David G Lawrence via freebsd-current wrote:
> > > On 27/03/21 06:04, David G Lawrence via freebsd-current wrote:
> > >>> On Fri, Mar 26, 2021 at 1:01 PM Graham Perrin <grahamperrin_at_gmail.com>
> > >>> wrote:
> > >>>
> > >>>> On 26/03/2021 03:40, The Doctor via freebsd-current wrote:
> > >>>>> ??? if people are having issues with ports like ???
> > >>>>
> > >>>> If I'm not mistaken:
> > >>>>
> > >>>> * 13.0-RC3 seems to be troublesome, as a guest machine, with
> > >>>> emulators/virtualbox-ose 6.1.18 as the host
> > >>>>
> > >>>> * no such trouble with 12.0-RELEASE-p5 as a guest.
> > >>>>
> > >>>> I hope to refine the bug report this weekend.
> > >>>>
> > >>>
> > >>> Had nothing but frequent guest lockups on 6.1.18 with my Win7 system. 
> > >>> That
> > >>> was right after 6.1.18 was put into ports. Fell back to legacy (v5) and
> > >>> will try again shortly to see if it's any better.
> > >>
> > >> Kevin,
> > >>
> > >> ?????? Make sure you have these options in your /etc/sysctl.conf :
> > >>
> > >> vfs.aio.max_buf_aio=8192
> > >> vfs.aio.max_aio_queue_per_proc=65536
> > >> vfs.aio.max_aio_per_proc=8192
> > >> vfs.aio.max_aio_queue=65536
> > >>
> > >> ?????? ...otherwise the guest I/O will random hang in VirtualBox. This 
> > >> issue was
> > >> mitigated in a late 5.x VirtualBox by patching to not use AIO, but the 
> > >> issue
> > >> came back in 6.x when that patch wasn't carried forward.
> > > 
> > > Sorry I lost that patch. Can you point me to the patch? Maybe it can be 
> > > easily ported.
> > > 
> > 
> > I found the relevant commit. Please give me some time for testing and 
> > I'll put this patch back in the tree.
> 
>    If you're going to put that patch back in, then AIO should probably be
> made an option in the port config, as shutting AIO off by default will
> have a significant performance impact. Without AIO, all guest IO will
> be become synchronous.
>    Ideally, someone would fix the AIO case by either increasing the defaults
> in FreeBSD to something reasonable, and/or properly handing the case when
> an AIO limit is reached.
> 
Agreed, it would be a shame to have AIO disabled by default. A one time update to sysctl.conf (per the existing pkg message!) is a small price to pay for much better performance.

-- 
Greg