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List:       freebsd-hackers
Subject:    Re: Amazon AMIs
From:       Warner Losh <imp () bsdimp ! com>
Date:       2019-02-21 16:17:48
Message-ID: CANCZdfp0ZWe11jXw_xnPi8G2QhyEeBTOcN_ks=sqJCqDjDYcQg () mail ! gmail ! com
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On Thu, Feb 21, 2019 at 1:02 AM Matthew Seaman <matthew@freebsd.org> wrote:

> On 20/02/2019 22:32, Jonathan Anderson wrote:
> > On 20 Feb 2019, at 18:50, Alex Dupre wrote:
> >
> >> Colin Percival wrote:
> >>> Last time I looked at this, we weren't handling hotplug/hotunplug of
> >>> "NVMe"
> >>> disks properly on the m5/c5/etc. instances.  I opted to recommend the
> >>> instance
> >>> which completely works rather than the one with slightly better
> >>> performance...
> >>
> >> It does happen only on a few instances, but I get some freezes on new t3
> >> machines: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235856
> >>
> >> They are indeed cheaper and more performant, but not 100% reliable in
> >> every workload.
> >
> > https://www.xkcd.com/937 ?
> >
>
> Yes, indeed.  That's a very good reason not to recommend the newest and
> shiniest.  I haven't seen any problems so far, but then again it's only
> been a day or so and we haven't got into the full testing regime quite
> yet.  I'll let you know if we do run into problems.
>
> Is there work on hot-plug NVMe going on?  ISTR jmg@ mentioning hotplug
> PCI at the dev summit at Stockholm EuroBSDCon, but not much since then.
>

It's hot-unplug that doesn't work quite right. Hotplug works, I believe, if
you have PCI_HP in your kernel, I believe.

What's needed is about a solid week of cleanup and testing in this area,
however.

Warner
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