Re: btrfs testing rawhide 0703

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On Tue, Jul 7, 2020 at 5:46 PM pmkellly@xxxxxxxxxxxx
<pmkellly@xxxxxxxxxxxx> wrote:
>
> I have been testing btrfs in a fresh install of Rawhide 0703 WS. I've
> mostly been doing my home grown "as deployed testing". So far the only
> potential maybe problem I can see is when I do the
> (QA:Testcase_base_reboot_unmount) I get a "recovery" error. it's very
> repeatable on every Restart. However as I look at the journal it's not
> clear if this is a problem or if we need to update the testcase for
> btrfs. I've attached the journal file for your reading pleasure.
>
> Also, I don't understand why this is raid6 There is only one disk in my
> test machine. Also I did nothing in the btrfs settings to call for a
> raid. I just took the btrfs defaults.

Jul 07 14:08:43 localhost.localdomain kernel: raid6: skip pq benchmark
and using algorithm avx2x4
Jul 07 14:08:43 localhost.localdomain kernel: raid6: using avx2x2
recovery algorithm

btrfs kernel module uses the kernel's generic raid6_pq module. And
when it loads, you see the above messages (or some variation thereof
depending on what algorithms get picked).

$ lsmod | grep raid
raid6_pq              122880  1 btrfs


It also uses the generic xor module for raid5, which also spits out
its own message.

$ lsmod | xor
xor                    24576  1 btrfs

[    2.814369] xor: automatically using best checksumming function   avx

It's normal and expected.

-- 
Chris Murphy
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