From 20c15f7c5248ae75df9c6f7b5b1433632420eda9 Mon Sep 17 00:00:00 2001 From: Max Reitz Date: Mon, 18 Jan 2021 11:57:18 +0100 Subject: iotests/129: Limit mirror job's buffer size Issuing 'stop' on the VM drains all nodes. If the mirror job has many large requests in flight, this may lead to significant I/O that looks a bit like 'stop' would make the job try to complete (which is what 129 should verify not to happen). We can limit the I/O in flight by limiting the buffer size, so mirror will make very little progress during the 'stop' drain. (We do not need to do anything about commit, which has a buffer size of 512 kB by default; or backup, which goes cluster by cluster. Once we have asynchronous requests for backup, that will change, but then we can fine-tune the backup job to only perform a single request on a very small chunk, too.) Signed-off-by: Max Reitz Reviewed-by: Eric Blake Reviewed-by: Vladimir Sementsov-Ogievskiy Reviewed-by: Willian Rampazzo Message-Id: <20210118105720.14824-9-mreitz@redhat.com> --- tests/qemu-iotests/129 | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tests/qemu-iotests/129 b/tests/qemu-iotests/129 index f4b447b04a..03843fc255 100755 --- a/tests/qemu-iotests/129 +++ b/tests/qemu-iotests/129 @@ -68,7 +68,7 @@ class TestStopWithBlockJob(iotests.QMPTestCase): def test_drive_mirror(self): self.do_test_stop("drive-mirror", device="drive0", target=self.target_img, format=iotests.imgfmt, - sync="full") + sync="full", buf_size=65536) def test_drive_backup(self): self.do_test_stop("drive-backup", device="drive0", -- cgit v1.2.3