Date: Thu, 21 Feb 2019 09:17:48 -0700 From: Warner Losh <imp@bsdimp.com> To: Matthew Seaman <matthew@freebsd.org> Cc: Jonathan Anderson <jonathan@freebsd.org>, Alex Dupre <ale@freebsd.org>, "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org>, Colin Percival <cperciva@freebsd.org> Subject: Re: Amazon AMIs Message-ID: <CANCZdfp0ZWe11jXw_xnPi8G2QhyEeBTOcN_ks=sqJCqDjDYcQg@mail.gmail.com> In-Reply-To: <f51b836f-6a40-9be3-425a-e1afd301507b@FreeBSD.org> References: <f002c020-1e63-c12f-456e-e20f8546a701@FreeBSD.org> <8a139c9c-b98b-4a54-1d7c-0ea1e3dc7a72@freebsd.org> <53a0bd68-a6ba-e8ad-4af2-abeb22e92c03@FreeBSD.org> <E396A0C7-F939-48A1-9B57-D643806B303B@FreeBSD.org> <f51b836f-6a40-9be3-425a-e1afd301507b@FreeBSD.org>
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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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