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Commit 103b47f1 authored by Neil Brown's avatar Neil Brown Committed by Linus Torvalds
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[PATCH] PATCH - kNFSd - Remove flowcontrol problems with lockd/tcp 

The sunrpc/tcp layer currently allocates some resources linearly with
number of server threads.  This causes problems when there are very
small numbers of threads (e.g. lockd with one thread), so this patch
adds a small constant to the number of threads before calculating
resoures to allocate.

This patch also provide proper upper-limits for the response sizes for
lockd requests, so resources are not over-allocated.

Together these resolve problems with heavy lockd load over tcp.
parent fb91d591
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Showing with 57 additions and 47 deletions
fs/lockd/svc4proc.c
View file @ 103b47f1
......@@ -537,31 +537,35 @@ struct nlm_void { int dummy; };
0, \
respsize, \
}
#define Ck (1+8) /* cookie */
#define No (1+1024/4) /* netobj */
#define St 1 /* status */
#define Rg 4 /* range (offset + length) */
struct svc_procedure nlmsvc_procedures4[] = {
PROC(null, void, void, void, void, 0),
PROC(test, testargs, testres, args, res, 0),
PROC(lock, lockargs, res, args, res, 0),
PROC(cancel, cancargs, res, args, res, 0),
PROC(unlock, unlockargs, res, args, res, 0),
PROC(granted, testargs, res, args, res, 0),
PROC(test_msg, testargs, norep, args, void, 0),
PROC(lock_msg, lockargs, norep, args, void, 0),
PROC(cancel_msg, cancargs, norep, args, void, 0),
PROC(unlock_msg, unlockargs, norep, args, void, 0),
PROC(granted_msg, testargs, norep, args, void, 0),
PROC(test_res, testres, norep, res, void, 0),
PROC(lock_res, lockres, norep, res, void, 0),
PROC(cancel_res, cancelres, norep, res, void, 0),
PROC(unlock_res, unlockres, norep, res, void, 0),
PROC(granted_res, grantedres, norep, res, void, 0),
PROC(null, void, void, void, void, 1),
PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
PROC(lock, lockargs, res, args, res, Ck+St),
PROC(cancel, cancargs, res, args, res, Ck+St),
PROC(unlock, unlockargs, res, args, res, Ck+St),
PROC(granted, testargs, res, args, res, Ck+St),
PROC(test_msg, testargs, norep, args, void, 1),
PROC(lock_msg, lockargs, norep, args, void, 1),
PROC(cancel_msg, cancargs, norep, args, void, 1),
PROC(unlock_msg, unlockargs, norep, args, void, 1),
PROC(granted_msg, testargs, norep, args, void, 1),
PROC(test_res, testres, norep, res, void, 1),
PROC(lock_res, lockres, norep, res, void, 1),
PROC(cancel_res, cancelres, norep, res, void, 1),
PROC(unlock_res, unlockres, norep, res, void, 1),
PROC(granted_res, grantedres, norep, res, void, 1),
/* statd callback */
PROC(sm_notify, reboot, void, reboot, void, 0),
PROC(sm_notify, reboot, void, reboot, void, 1),
PROC(none, void, void, void, void, 0),
PROC(none, void, void, void, void, 0),
PROC(none, void, void, void, void, 0),
PROC(share, shareargs, shareres, args, res, 0),
PROC(unshare, shareargs, shareres, args, res, 0),
PROC(nm_lock, lockargs, res, args, res, 0),
PROC(free_all, notify, void, args, void, 0),
PROC(share, shareargs, shareres, args, res, Ck+St+1),
PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
PROC(nm_lock, lockargs, res, args, res, Ck+St),
PROC(free_all, notify, void, args, void, 1),
};
fs/lockd/svcproc.c
View file @ 103b47f1
......@@ -565,31 +565,37 @@ struct nlm_void { int dummy; };
0, \
respsize, \
}
#define Ck (1+8) /* cookie */
#define St 1 /* status */
#define No (1+1024/4) /* Net Obj */
#define Rg 2 /* range - offset + size */
struct svc_procedure nlmsvc_procedures[] = {
PROC(null, void, void, void, void, 0),
PROC(test, testargs, testres, args, res, 0),
PROC(lock, lockargs, res, args, res, 0),
PROC(cancel, cancargs, res, args, res, 0),
PROC(unlock, unlockargs, res, args, res, 0),
PROC(granted, testargs, res, args, res, 0),
PROC(test_msg, testargs, norep, args, void, 0),
PROC(lock_msg, lockargs, norep, args, void, 0),
PROC(cancel_msg, cancargs, norep, args, void, 0),
PROC(unlock_msg, unlockargs, norep, args, void, 0),
PROC(granted_msg, testargs, norep, args, void, 0),
PROC(test_res, testres, norep, res, void, 0),
PROC(lock_res, lockres, norep, res, void, 0),
PROC(cancel_res, cancelres, norep, res, void, 0),
PROC(unlock_res, unlockres, norep, res, void, 0),
PROC(granted_res, grantedres, norep, res, void, 0),
PROC(null, void, void, void, void, 1),
PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
PROC(lock, lockargs, res, args, res, Ck+St),
PROC(cancel, cancargs, res, args, res, Ck+St),
PROC(unlock, unlockargs, res, args, res, Ck+St),
PROC(granted, testargs, res, args, res, Ck+St),
PROC(test_msg, testargs, norep, args, void, 1),
PROC(lock_msg, lockargs, norep, args, void, 1),
PROC(cancel_msg, cancargs, norep, args, void, 1),
PROC(unlock_msg, unlockargs, norep, args, void, 1),
PROC(granted_msg, testargs, norep, args, void, 1),
PROC(test_res, testres, norep, res, void, 1),
PROC(lock_res, lockres, norep, res, void, 1),
PROC(cancel_res, cancelres, norep, res, void, 1),
PROC(unlock_res, unlockres, norep, res, void, 1),
PROC(granted_res, grantedres, norep, res, void, 1),
/* statd callback */
PROC(sm_notify, reboot, void, reboot, void, 0),
PROC(none, void, void, void, void, 0),
PROC(none, void, void, void, void, 0),
PROC(none, void, void, void, void, 0),
PROC(share, shareargs, shareres, args, res, 0),
PROC(unshare, shareargs, shareres, args, res, 0),
PROC(nm_lock, lockargs, res, args, res, 0),
PROC(sm_notify, reboot, void, reboot, void, 1),
PROC(none, void, void, void, void, 1),
PROC(none, void, void, void, void, 1),
PROC(none, void, void, void, void, 1),
PROC(share, shareargs, shareres, args, res, Ck+St+1),
PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
PROC(nm_lock, lockargs, res, args, res, Ck+St),
PROC(free_all, notify, void, args, void, 0),
};
net/sunrpc/svcsock.c
View file @ 103b47f1
......@@ -710,7 +710,7 @@ svc_tcp_accept(struct svc_sock *svsk)
* We randomly choose between newest and oldest (in terms
* of recent activity) and drop it.
*/
if (serv->sv_tmpcnt > serv->sv_nrthreads*5) {
if (serv->sv_tmpcnt > (serv->sv_nrthreads+3)*5) {
struct svc_sock *svsk = NULL;
spin_lock_bh(&serv->sv_lock);
if (!list_empty(&serv->sv_tempsocks)) {
......@@ -924,7 +924,7 @@ svc_tcp_init(struct svc_sock *svsk)
* as soon a a complete request arrives.
*/
svc_sock_setbufsize(svsk->sk_sock,
svsk->sk_server->sv_nrthreads *
(svsk->sk_server->sv_nrthreads+3) *
svsk->sk_server->sv_bufsz,
3 * svsk->sk_server->sv_bufsz);
}
......@@ -966,7 +966,7 @@ svc_sock_update_bufs(struct svc_serv *serv)
if (sock->type == SOCK_STREAM) {
/* See svc_tcp_init above for rationale on buffer sizes */
svc_sock_setbufsize(sock,
serv->sv_nrthreads *
(serv->sv_nrthreads+3) *
serv->sv_bufsz,
3 * serv->sv_bufsz);
} else
......
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