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[Qemu-devel] [PATCH 2/3] nbd: use TCP_CORK in nbd_co_send_request()
From: |
Stefan Hajnoczi |
Subject: |
[Qemu-devel] [PATCH 2/3] nbd: use TCP_CORK in nbd_co_send_request() |
Date: |
Mon, 15 Apr 2013 16:14:47 +0200 |
Use TCP_CORK to defer packet transmission until both the header and the
payload have been written.
Suggested-by: Nick Thomas <address@hidden>
Signed-off-by: Stefan Hajnoczi <address@hidden>
---
block/nbd.c | 22 ++++++++++++++++------
1 file changed, 16 insertions(+), 6 deletions(-)
diff --git a/block/nbd.c b/block/nbd.c
index 662df16..485bbf0 100644
--- a/block/nbd.c
+++ b/block/nbd.c
@@ -334,13 +334,23 @@ static int nbd_co_send_request(BDRVNBDState *s, struct
nbd_request *request,
s->send_coroutine = qemu_coroutine_self();
qemu_aio_set_fd_handler(s->sock, nbd_reply_ready, nbd_restart_write,
nbd_have_request, s);
- rc = nbd_send_request(s->sock, request);
- if (rc >= 0 && qiov) {
- ret = qemu_co_sendv(s->sock, qiov->iov, qiov->niov,
- offset, request->len);
- if (ret != request->len) {
- rc = -EIO;
+ if (qiov) {
+ if (!s->is_unix) {
+ socket_set_cork(s->sock, 1);
}
+ rc = nbd_send_request(s->sock, request);
+ if (rc >= 0) {
+ ret = qemu_co_sendv(s->sock, qiov->iov, qiov->niov,
+ offset, request->len);
+ if (ret != request->len) {
+ rc = -EIO;
+ }
+ }
+ if (!s->is_unix) {
+ socket_set_cork(s->sock, 0);
+ }
+ } else {
+ rc = nbd_send_request(s->sock, request);
}
qemu_aio_set_fd_handler(s->sock, nbd_reply_ready, NULL,
nbd_have_request, s);
--
1.8.1.4