Re: [Xen-devel] [PATCH] oxenstored: fix short-write issue

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Tue, 2015-10-27 at 17:10 +0000, Wei Liu wrote:
> When oxenstored wrote to the ring, it wrote a chunk of contiguous data.
> Originally when it tried to write across ring boundary, it returned a
> short-write when there is still room.  That led to stalling mini-os's
> xenstore thread at times.

What is a "short-write" in this context?

Given data bytes 0..M I assumed it is only writing bytes 0..N and not
N+1..M because the ring boundary is at N. But what is it writing to the
->prod ring pointer N or M?

AIUI writing N should be allowed by the ring protocol, the client should
keep looking for more data until it has a complete request.

Writing M would be a server error.

Ian.


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