Date: Mon, 7 Mar 2016 16:48:28 +0100 From: Borja Marcos <borjam@sarenet.es> To: Jim Harris <jim.harris@gmail.com> Cc: FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org>, John Baldwin <jhb@freebsd.org> Subject: Re: FreeBSD 10.3 - nvme regression Message-ID: <9499E409-3573-47A7-ABF9-043FC4870FEE@sarenet.es> In-Reply-To: <CAJP=Hc8Oxz2bigh%2BbwgV1VRZuDWE%2BMHK5tJcpv-SD34sQfy%2BzQ@mail.gmail.com> References: <5A6B5C6F-26D1-40C5-8CCF-26EB8F17C59A@sarenet.es> <CAJP=Hc8Oxz2bigh%2BbwgV1VRZuDWE%2BMHK5tJcpv-SD34sQfy%2BzQ@mail.gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
> On 07 Mar 2016, at 15:28, Jim Harris <jim.harris@gmail.com> wrote: > (Moving to freebsd-stable. NVMe is not associated with the SCSI stack at all.) Oops, my apologies. I was assuming that, being storage stuff, -scsi was a good list. > Can you please file a bug report on this? Sure, doing doing some simple tests right now and I’ll file it. > > Also, can you try setting the following loader variable before install? > > hw.nvme.min_cpus_per_ioq=4 It now boots, thanks :) Note that it’s the first time I use NVMe drives, so bear with me in case I do anything stupid ;) I have noticed some odd performance problems. I have created a “raidz2” ZFS pool with the 10 drives. Doing some silly tests with several “Bonnie++” instances, I have noticed that delete commands seem to be very slow. After running several bonnie++ instances in parallel, when deleting the files, the drivers are almost stuck for a fairly long time, showing 100% bandwidth usage on “gstat” and indeed being painfully slow. Disabling the usage of BIO_DELETE for ZFS (sysctl vfs.zfs.vdev.bio_delete_disable=1) solves this problem, although, of course, BIO_DELETE is desirable as far as I know. I observed the same behavior on 10.2. This is not a proper report, I know, I will follow up tomorrow. Thanks! Borja.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?9499E409-3573-47A7-ABF9-043FC4870FEE>