From: Eric Wong <normalperson@yhbt.net>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Mel Gorman <mgorman@suse.de>,
linux-mm@kvack.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, Rik van Riel <riel@redhat.com>,
Minchan Kim <minchan@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: ppoll() stuck on POLLIN while TCP peer is sending
Date: Thu, 3 Jan 2013 18:32:51 +0000 [thread overview]
Message-ID: <20130103183251.GA10113@dcvr.yhbt.net> (raw)
In-Reply-To: <1357220469.21409.24574.camel@edumazet-glaptop>
Eric Dumazet <eric.dumazet@gmail.com> wrote:
> On Wed, 2013-01-02 at 20:47 +0000, Eric Wong wrote:
> > Eric Wong <normalperson@yhbt.net> wrote:
> > > [1] my full setup is very strange.
> > >
> > > Other than the FUSE component I forgot to mention, little depends on
> > > the kernel. With all this, the standalone toosleepy can get stuck.
> > > I'll try to reproduce it with less...
> >
> > I just confirmed my toosleepy processes will get stuck while just
> > doing "rsync -a" between local disks. So this does not depend on
> > sendfile or FUSE to reproduce.
> > --
>
> How do you tell your 'toosleepy' is stuck ?
My original post showed it stuck with strace (in ppoll + send).
I only strace after seeing it's not using any CPU in top.
http://mid.gmane.org/20121228014503.GA5017@dcvr.yhbt.net
(lsof also confirmed the ppoll/send sockets were peers)
> If reading its output, you should change its logic, there is no
> guarantee the recv() will deliver exactly 16384 bytes each round.
>
> With the following patch, I cant reproduce the 'apparent stuck'
Right, the output is just an approximation and the logic there
was bogus.
Thanks for looking at this.
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WARNING: multiple messages have this Message-ID (diff)
From: Eric Wong <normalperson@yhbt.net>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Mel Gorman <mgorman@suse.de>,
linux-mm@kvack.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, Rik van Riel <riel@redhat.com>,
Minchan Kim <minchan@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: ppoll() stuck on POLLIN while TCP peer is sending
Date: Thu, 3 Jan 2013 18:32:51 +0000 [thread overview]
Message-ID: <20130103183251.GA10113@dcvr.yhbt.net> (raw)
In-Reply-To: <1357220469.21409.24574.camel@edumazet-glaptop>
Eric Dumazet <eric.dumazet@gmail.com> wrote:
> On Wed, 2013-01-02 at 20:47 +0000, Eric Wong wrote:
> > Eric Wong <normalperson@yhbt.net> wrote:
> > > [1] my full setup is very strange.
> > >
> > > Other than the FUSE component I forgot to mention, little depends on
> > > the kernel. With all this, the standalone toosleepy can get stuck.
> > > I'll try to reproduce it with less...
> >
> > I just confirmed my toosleepy processes will get stuck while just
> > doing "rsync -a" between local disks. So this does not depend on
> > sendfile or FUSE to reproduce.
> > --
>
> How do you tell your 'toosleepy' is stuck ?
My original post showed it stuck with strace (in ppoll + send).
I only strace after seeing it's not using any CPU in top.
http://mid.gmane.org/20121228014503.GA5017@dcvr.yhbt.net
(lsof also confirmed the ppoll/send sockets were peers)
> If reading its output, you should change its logic, there is no
> guarantee the recv() will deliver exactly 16384 bytes each round.
>
> With the following patch, I cant reproduce the 'apparent stuck'
Right, the output is just an approximation and the logic there
was bogus.
Thanks for looking at this.
next prev parent reply other threads:[~2013-01-03 18:32 UTC|newest]
Thread overview: 88+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-28 1:45 ppoll() stuck on POLLIN while TCP peer is sending Eric Wong
2012-12-28 7:06 ` Eric Wong
2012-12-29 11:34 ` Eric Wong
2012-12-31 13:21 ` [PATCH] poll: prevent missed events if _qproc is NULL Eric Wong
2012-12-31 23:24 ` Eric Wong
2013-01-01 16:58 ` Junchang(Jason) Wang
2013-01-01 18:42 ` Eric Dumazet
2013-01-01 21:00 ` Eric Wong
2013-01-01 21:17 ` Eric Wong
2013-01-01 22:53 ` Linus Torvalds
2013-01-01 23:21 ` Junchang(Jason) Wang
2013-01-01 23:56 ` [PATCH] epoll: prevent missed events on EPOLL_CTL_MOD Eric Wong
2013-01-02 17:45 ` Eric Dumazet
2013-01-02 18:40 ` Eric Wong
2013-01-02 19:03 ` Eric Dumazet
2013-01-02 19:32 ` Eric Wong
2013-01-02 22:08 ` Eric Dumazet
2013-01-02 21:16 ` Eric Wong
2013-01-02 20:08 ` ppoll() stuck on POLLIN while TCP peer is sending Eric Wong
2013-01-02 20:08 ` Eric Wong
2013-01-02 20:47 ` Eric Wong
2013-01-02 20:47 ` Eric Wong
2013-01-03 13:41 ` Eric Dumazet
2013-01-03 13:41 ` Eric Dumazet
2013-01-03 18:32 ` Eric Wong [this message]
2013-01-03 18:32 ` Eric Wong
2013-01-03 23:45 ` Eric Wong
2013-01-03 23:45 ` Eric Wong
2013-01-04 0:26 ` Eric Wong
2013-01-04 0:26 ` Eric Wong
2013-01-04 3:52 ` Eric Wong
2013-01-04 3:52 ` Eric Wong
2013-01-04 16:01 ` Mel Gorman
2013-01-04 16:01 ` Mel Gorman
2013-01-04 17:15 ` Eric Dumazet
2013-01-04 17:15 ` Eric Dumazet
2013-01-04 17:59 ` Eric Wong
2013-01-04 17:59 ` Eric Wong
2013-01-05 1:07 ` Eric Wong
2013-01-05 1:07 ` Eric Wong
2013-01-06 12:07 ` Eric Wong
2013-01-06 12:07 ` Eric Wong
2013-01-07 12:25 ` Mel Gorman
2013-01-07 12:25 ` Mel Gorman
2013-01-07 22:38 ` Eric Dumazet
2013-01-07 22:38 ` Eric Dumazet
2013-01-08 0:21 ` Eric Wong
2013-01-08 0:21 ` Eric Wong
2013-01-07 22:38 ` Eric Wong
2013-01-07 22:38 ` Eric Wong
2013-01-08 20:14 ` Eric Wong
2013-01-08 20:14 ` Eric Wong
2013-01-08 22:43 ` Mel Gorman
2013-01-08 22:43 ` Mel Gorman
2013-01-08 23:23 ` Eric Wong
2013-01-08 23:23 ` Eric Wong
2013-01-09 2:14 ` Eric Dumazet
2013-01-09 2:14 ` Eric Dumazet
2013-01-09 2:32 ` Eric Dumazet
2013-01-09 2:32 ` Eric Dumazet
2013-01-09 2:54 ` Eric Dumazet
2013-01-09 2:54 ` Eric Dumazet
2013-01-09 3:55 ` Eric Wong
2013-01-09 3:55 ` Eric Wong
2013-01-09 8:42 ` Eric Wong
2013-01-09 8:42 ` Eric Wong
2013-01-09 8:51 ` Eric Wong
2013-01-09 8:51 ` Eric Wong
2013-01-09 13:42 ` Mel Gorman
2013-01-09 13:42 ` Mel Gorman
2013-01-09 13:37 ` Mel Gorman
2013-01-09 13:37 ` Mel Gorman
2013-01-09 13:50 ` Mel Gorman
2013-01-09 13:50 ` Mel Gorman
2013-01-10 9:25 ` Eric Wong
2013-01-10 9:25 ` Eric Wong
2013-01-10 19:42 ` Mel Gorman
2013-01-10 19:42 ` Mel Gorman
2013-01-10 20:03 ` Eric Wong
2013-01-10 20:03 ` Eric Wong
2013-01-10 20:58 ` Eric Dumazet
2013-01-10 20:58 ` Eric Dumazet
2013-01-11 0:51 ` Eric Wong
2013-01-11 0:51 ` Eric Wong
2013-01-11 9:30 ` Mel Gorman
2013-01-11 9:30 ` Mel Gorman
2013-01-09 21:29 ` Eric Wong
2013-01-09 21:29 ` Eric Wong
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