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authorStefan Metzmacher <metze@samba.org>2012-11-02 13:56:53 +0100
committerVolker Lendecke <vl@samba.org>2012-11-05 17:13:40 +0100
commit719595b6f7f8745f2608dddb2b86476b9cc2f598 (patch)
tree7c76ef4dffbf6ff437a9cdbee3e75171ed308c66 /lib
parente42889f83f261e2ac34014649476fae638a6e1f2 (diff)
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lib/tsocket: optimize syscalls in tstream_readv_pdu_send()
Once we've got the first part of a pdu we try to optimize readv calls for the rest of the pdu. Signed-off-by: Stefan Metzmacher <metze@samba.org>
Diffstat (limited to 'lib')
-rw-r--r--lib/tsocket/tsocket_helpers.c29
1 files changed, 29 insertions, 0 deletions
diff --git a/lib/tsocket/tsocket_helpers.c b/lib/tsocket/tsocket_helpers.c
index 1b92b9f82c..49c6840f87 100644
--- a/lib/tsocket/tsocket_helpers.c
+++ b/lib/tsocket/tsocket_helpers.c
@@ -215,6 +215,20 @@ static void tstream_readv_pdu_ask_for_next_vector(struct tevent_req *req)
size_t to_read = 0;
size_t i;
struct tevent_req *subreq;
+ bool optimize = false;
+ bool save_optimize = false;
+
+ if (state->count > 0) {
+ /*
+ * This is not the first time we asked for a vector,
+ * which means parts of the pdu already arrived.
+ *
+ * In this case it make sense to enable
+ * a syscall/performance optimization if the
+ * low level tstream implementation supports it.
+ */
+ optimize = true;
+ }
TALLOC_FREE(state->vector);
state->count = 0;
@@ -258,11 +272,26 @@ static void tstream_readv_pdu_ask_for_next_vector(struct tevent_req *req)
return;
}
+ if (optimize) {
+ /*
+ * If the low level stream is a bsd socket
+ * we will get syscall optimization.
+ *
+ * If it is not a bsd socket
+ * tstream_bsd_optimize_readv() just returns.
+ */
+ save_optimize = tstream_bsd_optimize_readv(state->caller.stream,
+ true);
+ }
subreq = tstream_readv_send(state,
state->caller.ev,
state->caller.stream,
state->vector,
state->count);
+ if (optimize) {
+ tstream_bsd_optimize_readv(state->caller.stream,
+ save_optimize);
+ }
if (tevent_req_nomem(subreq, req)) {
return;
}