Re: [PATCH v2 19/19] sunrpc: Disable splice for krb5i

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> On Jun 18, 2017, at 3:34 AM, Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote:
> 
> On Sat, Jun 17, 2017 at 01:23:24PM -0400, Chuck Lever wrote:
>> 
>>> On Jun 17, 2017, at 11:07 AM, Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote:
>>> 
>>> On Fri, Jun 16, 2017 at 11:22:54AM -0400, Chuck Lever wrote:
>>>> Running a multi-threaded 8KB fio test (70/30 mix), three or four out
>>>> of twelve of the jobs fail when using krb5i. The failure is an EIO
>>>> on a read.
>>> 
>>> Just curious: what is the backing fs that you tested with?  I'd be
>>> curious if you see this on XFS for example.
>> 
>> I was able to reproduce this with a tmpfs share and
>> with an XFS share on NVMe LUNs.
> 
> Interesting.  XFS actually locks out all writes while doing a buffered
> read, so we end up with two different read instance for the hash vs
> the data, which does indeed sound dangerous.

I'm going to submit this again with a comment change and
Jeff's Reviewed-by. Can I add your Reviewed-by as well?


--
Chuck Lever



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