git: 2224a2872be1 - stable/13 - Bump CTL block backend threads from 14 to 32 per LUN.

[Alexander Motin]

The branch stable/13 has been updated by mav:

URL: https://cgit.FreeBSD.org/src/commit/?id=2224a2872be189055ce5ff96700502a950bfd548

commit 2224a2872be189055ce5ff96700502a950bfd548
Author:     Alexander Motin <mav at FreeBSD.org>
AuthorDate: 2021-02-23 15:58:56 +0000
Commit:     Alexander Motin <mav at FreeBSD.org>
CommitDate: 2021-03-02 00:43:09 +0000

    Bump CTL block backend threads from 14 to 32 per LUN.
    
    This makes random read benchmarks look better on a wide ZFS pools.
    I am not sure where the original value goes from, but it is there
    for too long now.
    
    MFC after:      1 week
    
    (cherry picked from commit 7d4c444374d53e54ce197138df64bf40c1fb05a3)
---
 sys/cam/ctl/ctl_backend_block.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/cam/ctl/ctl_backend_block.c b/sys/cam/ctl/ctl_backend_block.c
index cd4fab766844..c4e5e0dcf26d 100644
--- a/sys/cam/ctl/ctl_backend_block.c
+++ b/sys/cam/ctl/ctl_backend_block.c
@@ -226,7 +226,7 @@ struct ctl_be_block_io {
 
 extern struct ctl_softc *control_softc;
 
-static int cbb_num_threads = 14;
+static int cbb_num_threads = 32;
 SYSCTL_NODE(_kern_cam_ctl, OID_AUTO, block, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
 	    "CAM Target Layer Block Backend");
 SYSCTL_INT(_kern_cam_ctl_block, OID_AUTO, num_threads, CTLFLAG_RWTUN,