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Re: [Qemu-devel] [PATCH v6 00/12] curl: fix curl read

From: Fam Zheng
Subject: Re: [Qemu-devel] [PATCH v6 00/12] curl: fix curl read
Date: Tue, 28 May 2013 19:14:01 +0800
User-agent: Mutt/1.5.21 (2010-09-15)

On Tue, 05/28 12:01, Richard W.M. Jones wrote:
> On Tue, May 28, 2013 at 11:35:20AM +0100, Richard W.M. Jones wrote:
> > I'm continuing to investigate.
> Some more data points:
> v6 patch, with my laptop plugged directly into the gigabit ethernet
> switch which is connected to the web server:
>  - Worked perfectly 5 times in a row.
> v6 patch, with my laptop next to the wifi aerial:
>  - Bug is harder to reproduce, maybe only happens 50% of runs.
> v6 patch, with my laptop about 100' from the wifi aerial:
>  - Bug reproduces on every run.
> So something to do with long latency links.
> Question: Is there a place in the patch we could put a sleep in order
> to simulate a long latency link?
> I also checked the logs on the web server.  There are no errors, and
> each access returned a 200 or 206.  So the problem doesn't appear to
> be at the web server end.
> Rich.

There seems no easy way to me to inject sleep to io reqs in curl.c.
Another option might be configure & compile qemu with
CFLAGS=-DDEBUG_CURL and grab the stdout, so that we can see how requests
are processed.


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