svn commit: r285767 - head/sys/dev/nvd

[Jim Harris]

Author: jimharris
Date: Tue Jul 21 20:53:21 2015
New Revision: 285767
URL: https://svnweb.freebsd.org/changeset/base/285767

Log:
  nvd: set d_delmaxsize to full capacity of NVMe namespace
  
  The NVMe specification has no ability to specify a maximum delete size
  that is less than the full capacity of the namespace - so just using the
  namespace size is the correct value here.
  
  This fixes reported issues where ZFS trim on init looked like it was
  hanging the system - previously the default I/O max size (128KB on
  Intel NVMe controllers) was used for delete operations which worked out
  to only about 8MB/s.  With this patch I can add an 800GB DC P3700
  drive to a ZFS pool in about 15-20 seconds.
  
  Reported by: Dylan Just <dylan at techtangents.com>
  MFC after:	3 days
  Sponsored by:	Intel

Modified:
  head/sys/dev/nvd/nvd.c

Modified: head/sys/dev/nvd/nvd.c
==============================================================================
--- head/sys/dev/nvd/nvd.c	Tue Jul 21 20:33:36 2015	(r285766)
+++ head/sys/dev/nvd/nvd.c	Tue Jul 21 20:53:21 2015	(r285767)
@@ -278,6 +278,7 @@ nvd_new_disk(struct nvme_namespace *ns, 
 	disk->d_maxsize = nvme_ns_get_max_io_xfer_size(ns);
 	disk->d_sectorsize = nvme_ns_get_sector_size(ns);
 	disk->d_mediasize = (off_t)nvme_ns_get_size(ns);
+	disk->d_delmaxsize = (off_t)nvme_ns_get_size(ns);
 
 	if (TAILQ_EMPTY(&disk_head))
 		disk->d_unit = 0;