linux-kernel - Re: epoll with ONESHOT possibly fails to deliver events

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Message-Id: <4854E278-265E-433E-B55E-E60DA4C300F2@yale.edu>
Date:	Mon, 17 Dec 2012 21:35:15 -0500
From:	Andreas Voellmy <andreas.voellmy@...e.edu>
To:	Eric Wong <normalperson@...t.net>
Cc:	viro@...iv.linux.org.uk, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"junchang.wang@...e.edu Wang" <junchang.wang@...e.edu>
Subject: Re: epoll with ONESHOT possibly fails to deliver events


On Dec 17, 2012, at 9:07 PM, Eric Wong <normalperson@...t.net> wrote:

> Andreas Voellmy <andreas.voellmy@...e.edu> wrote:
>> There were a couple of errors in the code when I posted my last
>> message. I have fixed those. The epoll bug still occurs. 
> 
> Sorry I haven't gotten around to this.
> 
> Can you reproduce this with fewer cores? (I only have 4 at most).

I've been able to reproduce it on as few as 8 cores. I've never seen it occur with fewer than that.

> Have you tried the latest stable kernel version?

No, I've only tried 3.4.0.0.

> 
> Can you reproduce this over TCP loopback, or only across two machines?
> If the latter, it could also be a driver or firmware bug...

Yes, it also occurs when I run the http request generator on the same machine on the loopback interface.

-Andi--
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