Sometimes multifd sends just sync packet with no pages (normal_num is 0). In this case the old value is being preserved and being accounted for while only packet_len is being transferred. Reset it to 0 after sending and accounting for.
TODO: Fix the same packet ids in the stream. with this patch, there is still an issue with the duplicated packets ids being sent (with different number of pages/flags). See in below multifd_send trace (before this change): multifd_send 394.774 pid=55477 id=0x1 packet_num=0x6f0 normal=0x57 flags=0x1 next_packet_size=0x57000 multifd_send 181.244 pid=55477 id=0x1 packet_num=0x6f0 normal=0x0 flags=0x0 next_packet_size=0x57000 With this commit there are still duplicated packets, but since no pages are being sent with sync flag set, next_packet_size is 0: multifd_send 27.814 pid=18602 id=0x1 packet_num=0x574 normal=0x7b flags=0x1 next_packet_size=0x7b000 multifd_send 136054.792 pid=18602 id=0x1 packet_num=0x574 normal=0x0 flags=0x0 next_packet_size=0x0 If there is a suggestion how to fix this properly, I will be glad to use it. Signed-off-by: Elena Ufimtseva <elena.ufimts...@oracle.com> --- migration/multifd.c | 1 + 1 file changed, 1 insertion(+) diff --git a/migration/multifd.c b/migration/multifd.c index 3281397b18..8b4e26051b 100644 --- a/migration/multifd.c +++ b/migration/multifd.c @@ -730,6 +730,7 @@ static void *multifd_send_thread(void *opaque) p->next_packet_size + p->packet_len); stat64_add(&mig_stats.transferred, p->next_packet_size + p->packet_len); + p->next_packet_size = 0; qemu_mutex_lock(&p->mutex); p->pending_job--; qemu_mutex_unlock(&p->mutex); -- 2.34.1