Author: imp
Date: Tue Mar 20 03:37:09 2018
New Revision: 331238
URL: https://svnweb.freebsd.org/changeset/base/331238
Log:
Make kern.cam.nda.num_trim tunable to limit the number of BIO_DELETE
requests that we'll collapse into one DSM_TRIM. By default it is a
256, which is the max that will fit into a 4k page.
Sponsored by: Netflix
Modified:
head/sys/cam/nvme/nvme_da.c
Modified: head/sys/cam/nvme/nvme_da.c
==============================================================================
--- head/sys/cam/nvme/nvme_da.c Tue Mar 20 03:37:04 2018 (r331237)
+++ head/sys/cam/nvme/nvme_da.c Tue Mar 20 03:37:09 2018 (r331238)
@@ -167,19 +167,22 @@ static void ndasuspend(void *arg);
#define NDA_MAX_TRIM_ENTRIES 256 /* Number of DSM trims to use, max 256
*/
#endif
+static SYSCTL_NODE(_kern_cam, OID_AUTO, nda, CTLFLAG_RD, 0,
+ "CAM Direct Access Disk driver");
+
//static int nda_retry_count = NDA_DEFAULT_RETRY;
static int nda_send_ordered = NDA_DEFAULT_SEND_ORDERED;
static int nda_default_timeout = NDA_DEFAULT_TIMEOUT;
static int nda_max_trim_entries = NDA_MAX_TRIM_ENTRIES;
+SYSCTL_INT(_kern_cam_nda, OID_AUTO, max_trim, CTLFLAG_RDTUN,
+ &nda_max_trim_entries, NDA_MAX_TRIM_ENTRIES,
+ "Maximum number of BIO_DELETE to send down as a DSM TRIM.");
/*
* All NVMe media is non-rotational, so all nvme device instances
* share this to implement the sysctl.
*/
static int nda_rotating_media = 0;
-
-static SYSCTL_NODE(_kern_cam, OID_AUTO, nda, CTLFLAG_RD, 0,
- "CAM Direct Access Disk driver");
static struct periph_driver ndadriver =
{
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