[PATCH 8/9] kvm: qemu: Drop the mutex while reading from tapfd

Mark McLoughlin
2008-07-24T11:46:35Z

The idea here is that with GSO, packets are much larger
and we can allow the vcpu threads to e.g. process irq
acks during the window where we're reading these
packets from the tapfd.

Signed-off-by: Mark McLoughlin <markmc@redhat.com>
---
qemu/vl.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/qemu/vl.c b/qemu/vl.c
index efdaafd..de92848 100644
--- a/qemu/vl.c
+++ b/qemu/vl.c
@@ -4281,7 +4281,9 @@ static void tap_send(void *opaque)
sbuf.buf = s->buf;
s->size = getmsg(s->fd, NULL, &sbuf, &f) >=0 ? sbuf.len : -1;
#else
+ kvm_sleep_begin();
s->size = read(s->fd, s->buf, sizeof(s->buf));
+ kvm_sleep_end();
#endif

if (s->size == -1 && errno == EINTR)
--
1.5.4.1