diff options
| author |   mikeb <mikeb@openbsd.org> | 2017-07-17 16:04:31 +0000 |
|---|---|---|
| committer | mikeb <mikeb@openbsd.org> | 2017-07-17 16:04:31 +0000 |
| commit | e885e14e7616a60b3d766dd30f26dafb03274a71 (patch) | |
| tree | fa5819a0357e73eadc944481673e9fc3ea8088ef /sys/dev/pv/xen.c | |
| parent | Pick the correct TX buffer when unrolling (diff) | |
| download | wireguard-openbsd-e885e14e7616a60b3d766dd30f26dafb03274a71.tar.xz wireguard-openbsd-e885e14e7616a60b3d766dd30f26dafb03274a71.zip | |
Reduce amount of CAS attempts in a busy-wait loop by a factor of 100
Diffstat (limited to 'sys/dev/pv/xen.c')
| -rw-r--r-- | sys/dev/pv/xen.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/sys/dev/pv/xen.c b/sys/dev/pv/xen.c index b7611ebbece..f2630156aac 100644 --- a/sys/dev/pv/xen.c +++ b/sys/dev/pv/xen.c @@ -1,4 +1,4 @@ -/* $OpenBSD: xen.c,v 1.85 2017/07/14 21:53:34 mikeb Exp $ */ +/* $OpenBSD: xen.c,v 1.86 2017/07/17 16:04:31 mikeb Exp $ */ /* * Copyright (c) 2015, 2016, 2017 Mike Belopuhov @@ -1212,7 +1212,7 @@ xen_grant_table_remove(struct xen_softc *sc, grant_ref_t ref) (ge->ge_table[ref].domid << 16); loop = 0; while (atomic_cas_uint(ptr, flags, GTF_invalid) != flags) { - if (loop++ > 1000) { + if (loop++ > 10) { printf("%s: grant table reference %u is held " "by domain %d\n", sc->sc_dev.dv_xname, ref + ge->ge_start, ge->ge_table[ref].domid); |