d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

cam iosched: default to no read bias in dynamic ioscheduling

Browse Source 
When we're doing dynamic I/O scheduling, don't default to a read bias of
100. Default it to 0 so turning on dynamic scheduling only does
scheduling tweaks that are requested. The other limiters are off by
default, and need no further adjustment.

Sponsored by:		Netflix
This commit is contained in:
Warner Losh 2022-05-01 11:18:23 -06:00
parent cc1572ddeb
commit b65803ba57
1 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
sys/cam/cam_iosched.c
View File

@ -1149,8 +1149,8 @@ cam_iosched_init(struct cam_iosched_softc **iscp, struct cam_periph *periph)
#ifdef CAM_IOSCHED_DYNAMIC
if (do_dynamic_iosched) {
bioq_init(&(*iscp)->write_queue);
(*iscp)->read_bias = 100;
(*iscp)->current_read_bias = 100;
(*iscp)->read_bias = 0;
(*iscp)->current_read_bias = 0;
(*iscp)->quanta = min(hz, 200);
cam_iosched_iop_stats_init(*iscp, &(*iscp)->read_stats);
cam_iosched_iop_stats_init(*iscp, &(*iscp)->write_stats);
@ -1234,7 +1234,7 @@ void cam_iosched_sysctl_init(struct cam_iosched_softc *isc,
SYSCTL_ADD_INT(ctx, n,
OID_AUTO, "read_bias", CTLFLAG_RW,
&isc->read_bias, 100,
&isc->read_bias, 0,
"How biased towards read should we be independent of limits");
SYSCTL_ADD_PROC(ctx, n,