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By default, when doing crypto work in software, start as many threads

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as we have active CPUs and bind each thread to its own CPU.

MFC after:	3 days
This commit is contained in:
Pawel Jakub Dawidek 2005-08-21 18:12:51 +00:00
parent b8db9f58da
commit dd549194ae
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=149353
2 changed files with 13 additions and 6 deletions
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4
sbin/geom/class/eli/geli.8
View File

@ -445,10 +445,12 @@ passphrase can be logged and exposed via
.Xr dmesg 8 .
This variable should be set in
.Pa /boot/loader.conf .
.It Va kern.geom.eli.threads : No 1
.It Va kern.geom.eli.threads : No 0
Specifies how many kernel threads should be used for doing software
cryptography.
Its purpose is to increase performance on SMP systems.
If hardware acceleration is available, only one thread will be started.
If set to 0, CPU-bound thread will be started for every active CPU.
This variable could be set in
.Pa /boot/loader.conf .
.El

15
sys/geom/eli/g_eli.c
View File

@ -39,6 +39,7 @@ __FBSDID("$FreeBSD$");
#include <sys/kthread.h>
#include <sys/proc.h>
#include <sys/sched.h>
#include <sys/smp.h>
#include <sys/uio.h>
#include <vm/uma.h>
@ -68,7 +69,7 @@ SYSCTL_UINT(_kern_geom_eli, OID_AUTO, visible_passphrase, CTLFLAG_RW,
u_int g_eli_overwrites = 5;
SYSCTL_UINT(_kern_geom_eli, OID_AUTO, overwrites, CTLFLAG_RW, &g_eli_overwrites,
0, "Number of overwrites on-disk keys when destroying");
static u_int g_eli_threads = 1;
static u_int g_eli_threads = 0;
TUNABLE_INT("kern.geom.eli.threads", &g_eli_threads);
SYSCTL_UINT(_kern_geom_eli, OID_AUTO, threads, CTLFLAG_RW, &g_eli_threads, 0,
"Number of threads doing crypto work");
@ -391,6 +392,8 @@ g_eli_worker(void *arg)
sc = wr->w_softc;
mtx_lock_spin(&sched_lock);
sched_prio(curthread, PRIBIO);
if (sc->sc_crypto == G_ELI_CRYPTO_SW && g_eli_threads == 0)
sched_bind(curthread, wr->w_number);
mtx_unlock_spin(&sched_lock);
G_ELI_DEBUG(1, "Thread %s started.", curthread->td_proc->p_comm);
@ -738,10 +741,12 @@ g_eli_create(struct gctl_req *req, struct g_class *mp, struct g_provider *bpp,
cri.cri_key = sc->sc_datakey;
threads = g_eli_threads;
/* There is really no need for too many worker threads. */
if (threads > MAXCPU) {
G_ELI_DEBUG(0, "Reducing number of threads to %u.", MAXCPU);
threads = MAXCPU;
if (threads == 0)
threads = mp_ncpus;
else if (threads > mp_ncpus) {
/* There is really no need for too many worker threads. */
threads = mp_ncpus;
G_ELI_DEBUG(0, "Reducing number of threads to %u.", threads);
}
for (i = 0; i < threads; i++) {
wr = malloc(sizeof(*wr), M_ELI, M_WAITOK | M_ZERO);