diff options
author | Wangkai (Kevin,C) <wangkai86@huawei.com> | 2014-07-18 09:33:42 +0000 |
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committer | Stefan Hajnoczi <stefanha@redhat.com> | 2014-12-19 11:19:22 +0000 |
commit | 756ae78b275a0625b4559a8fc448df4c6eb331a8 (patch) | |
tree | 848dab20a08d39d6bf80054c002e5f962a7ce3c3 /net | |
parent | 86b182ac0e0b44726d85598cbefb468ed22517fc (diff) | |
download | hqemu-756ae78b275a0625b4559a8fc448df4c6eb331a8.zip hqemu-756ae78b275a0625b4559a8fc448df4c6eb331a8.tar.gz |
tap: fix vcpu long time io blocking on tap
[Adjusted doc comment for grammar.
--Stefan]
Signed-off-by: Wangkai <wangkai86@huawei.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'net')
-rw-r--r-- | net/tap.c | 12 |
1 files changed, 12 insertions, 0 deletions
@@ -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; + } } } |