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Re: [Qemu-devel] [Qemu-block] Problem with data miscompare using scsi-hd
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From: |
Stefan Hajnoczi |
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Subject: |
Re: [Qemu-devel] [Qemu-block] Problem with data miscompare using scsi-hd, cache=none and io=threads |
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Date: |
Thu, 24 May 2018 15:04:53 +0100 |
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User-agent: |
Mutt/1.9.5 (2018-04-13) |
On Tue, May 15, 2018 at 06:25:46PM -0300, Daniel Henrique Barboza wrote:
> This means that the test executed a write at LBA 0x94fa and, after
> confirming that the write was completed, issue 2 reads in the same LBA to
> assert the written contents and found out a mismatch.
Have you confirmed this pattern at various levels in the stack:
1. Application inside the guest (strace)
2. Guest kernel block layer (blktrace)
3. QEMU (strace)
4. Host kernel block layer (blktrace)
The key thing is that the write completes before the 2 reads are
submitted.
Have you tried running the test on bare metal?
Stefan
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