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>
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> 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.=20 > Can you please file a bug report on this? Sure, doing doing some simple tests right now and I=E2=80=99ll file it. >=20 > Also, can you try setting the following loader variable before = install? >=20 > hw.nvme.min_cpus_per_ioq=3D4 It now boots, thanks :) Note that it=E2=80=99s 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 = =E2=80=9Craidz2=E2=80=9D ZFS pool with the 10 drives. Doing some silly tests with several =E2=80=9CBonnie++=E2=80=9D = 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 = =E2=80=9Cgstat=E2=80=9D and indeed being painfully slow. Disabling the usage of BIO_DELETE for ZFS (sysctl = vfs.zfs.vdev.bio_delete_disable=3D1) solves this problem, although, of course, BIO_DELETE is desirable as far as I know.=20 I observed the same behavior on 10.2. This is not a proper report, I know, I will follow up tomorrow.=20 Thanks! Borja.
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