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block: fix initialization in bdrv_io_limits_enable()

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bdrv_io_limits_enable() starts a new slice, but does not set io_base
correctly for that slice.

Here is how io_base is used:

    bytes_base  = bs->nr_bytes[is_write] - bs->io_base.bytes[is_write];
    bytes_res   = (unsigned) nb_sectors * BDRV_SECTOR_SIZE;

    if (bytes_base + bytes_res <= bytes_limit) {
        /* no wait */
    } else {
        /* operation needs to be throttled */
    }

As a result, any I/O operations that are triggered between now and
bs->slice_end are incorrectly limited.  If 10 MB of data has been
written since the VM was started, QEMU thinks that 10 MB of data has
been written in this slice. This leads to a I/O lockup in the guest.

We fix this by delaying the start of a new slice to the next
call of bdrv_exceed_io_limits().

Signed-off-by: Peter Lieven <pl@kamp.de>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Peter Lieven 2013-01-11 13:29:55 +01:00 committed by Stefan Hajnoczi
parent 8d2497c355
commit 029d091e49
1 changed files with 0 additions and 4 deletions
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4
block.c
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@ -155,10 +155,6 @@ void bdrv_io_limits_enable(BlockDriverState *bs)
{
qemu_co_queue_init(&bs->throttled_reqs);
bs->block_timer = qemu_new_timer_ns(vm_clock, bdrv_block_timer, bs);
bs->slice_time = 5 * BLOCK_IO_SLICE_TIME;
bs->slice_start = qemu_get_clock_ns(vm_clock);
bs->slice_end = bs->slice_start + bs->slice_time;
memset(&bs->io_base, 0, sizeof(bs->io_base));
bs->io_limits_enabled = true;
}