FreeBSD 10.3 - nvme regression
borjam at sarenet.es
Mon Mar 7 15:48:33 UTC 2016
> On 07 Mar 2016, at 15:28, Jim Harris <jim.harris at 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?
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
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.
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