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commit 7ad3bd1293fff362f5c66ebce48387cfce4f436c
Author: imp <imp@FreeBSD.org>
Date:   Tue Sep 12 23:46:33 2017 +0000

    cam iosched: Limit the quanta default to hz if it's below 200
    
    The cam_iosched_ticker() can't be scheduled more than once per tick.
    Some limiters depend on quanta matching the number of calls per second
    to enforce the proper limits. Limit the quanta to no faster than 1 per
    clock tick. This fixes some features when running in VMs where the
    default HZ is 100.
    
    PR: 221953
    Obtained from: ElectroBSD
    Differential Revision: https://reviews.freebsd.org/D12337
    Submitted by: Fabian Keil

Notes:
    svn path=/head/; revision=323511

diff --git a/sys/cam/cam_iosched.c b/sys/cam/cam_iosched.c
index 422096796d51..52e1092dd183 100644
--- a/sys/cam/cam_iosched.c
+++ b/sys/cam/cam_iosched.c
@@ -1022,7 +1022,7 @@ cam_iosched_init(struct cam_iosched_softc **iscp, struct cam_periph *periph)
                bioq_init(&(*iscp)->write_queue);
                (*iscp)->read_bias = 100;
                (*iscp)->current_read_bias = 100;
-               (*iscp)->quanta = 200;
+               (*iscp)->quanta = min(hz, 200);
[...]