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buffered_file: do not send more than s->bytes_xfer bytes per tick 

Sending more was possible if the buffer was large.

Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
(cherry picked from commit bde54c08b4)

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
This commit is contained in:
Paolo Bonzini 2012-11-20 12:48:19 +01:00 committed by Michael Roth
parent d745511fc9
commit ff0c079c14
1 changed files with 2 additions and 2 deletions
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4
buffered_file.c
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@ -66,9 +66,9 @@ static ssize_t buffered_flush(QEMUFileBuffered *s)
DPRINTF("flushing %zu byte(s) of data\n", s->buffer_size);
while (s->bytes_xfer < s->xfer_limit && offset < s->buffer_size) {
size_t to_send = MIN(s->buffer_size - offset, s->xfer_limit - s->bytes_xfer);
ret = migrate_fd_put_buffer(s->migration_state, s->buffer + offset,
s->buffer_size - offset);
to_send);
if (ret == -EAGAIN) {
DPRINTF("backend not ready, freezing\n");
ret = 0;