Commit 756ae78b authored by Wangkai (Kevin,C)'s avatar Wangkai (Kevin,C) Committed by Stefan Hajnoczi
Browse files

tap: fix vcpu long time io blocking on tap 



[Adjusted doc comment for grammar.
--Stefan]

Signed-off-by: default avatarWangkai <wangkai86@huawei.com>
Signed-off-by: default avatarStefan Hajnoczi <stefanha@redhat.com>
parent 86b182ac

net/tap.c

+12 −0
Original line number Diff line number Diff line
@@ -189,6 +189,7 @@ static void tap_send(void *opaque) 
{

    TAPState *s = opaque;

    int size;

    int packets = 0;



    while (qemu_can_send_packet(&s->nc)) {

        uint8_t *buf = s->buf;
@@ -210,6 +211,17 @@ static void tap_send(void *opaque) 
        } else if (size < 0) {

            break;

        }



        /*

         * When the host keeps receiving more packets while tap_send() is

         * running we can hog the QEMU global mutex.  Limit the number of

         * packets that are processed per tap_send() callback to prevent

         * stalling the guest.

         */

        packets++;

        if (packets >= 50) {

            break;

        }

    }

}