From: Eric Wong <normalperson@yhbt.net>
To: Eric Dumazet <erdnetdev@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: Wed, 9 Jan 2013 08:42:47 +0000 [thread overview]
Message-ID: <20130109084247.GA6545@dcvr.yhbt.net> (raw)
In-Reply-To: <20130109035511.GA6857@dcvr.yhbt.net>
Eric Wong <normalperson@yhbt.net> wrote:
> Eric Dumazet <erdnetdev@gmail.com> wrote:
> > On Tue, 2013-01-08 at 18:32 -0800, Eric Dumazet wrote:
> > > Hmm, it seems sk_filter() can return -ENOMEM because skb has the
> > > pfmemalloc() set.
> >
> > >
> > > One TCP socket keeps retransmitting an SKB via loopback, and TCP stack
> > > drops the packet again and again.
> >
> > sock_init_data() sets sk->sk_allocation to GFP_KERNEL
> >
> > Shouldnt it use (GFP_KERNEL | __GFP_NOMEMALLOC) instead ?
>
> Thanks, things are running good after ~35 minutes so far.
> Will report back if things break (hopefully I don't run out
> of laptop battery power :x).
Oops, I had to restart my test :x. However, I was able to reproduce the
issue very quickly again with your patch. I've double-checked I'm
booting into the correct kernel, but I do have more load on this
laptop host now, so maybe that made it happen more quickly...
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WARNING: multiple messages have this Message-ID (diff)
From: Eric Wong <normalperson@yhbt.net>
To: Eric Dumazet <erdnetdev@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: Wed, 9 Jan 2013 08:42:47 +0000 [thread overview]
Message-ID: <20130109084247.GA6545@dcvr.yhbt.net> (raw)
In-Reply-To: <20130109035511.GA6857@dcvr.yhbt.net>
Eric Wong <normalperson@yhbt.net> wrote:
> Eric Dumazet <erdnetdev@gmail.com> wrote:
> > On Tue, 2013-01-08 at 18:32 -0800, Eric Dumazet wrote:
> > > Hmm, it seems sk_filter() can return -ENOMEM because skb has the
> > > pfmemalloc() set.
> >
> > >
> > > One TCP socket keeps retransmitting an SKB via loopback, and TCP stack
> > > drops the packet again and again.
> >
> > sock_init_data() sets sk->sk_allocation to GFP_KERNEL
> >
> > Shouldnt it use (GFP_KERNEL | __GFP_NOMEMALLOC) instead ?
>
> Thanks, things are running good after ~35 minutes so far.
> Will report back if things break (hopefully I don't run out
> of laptop battery power :x).
Oops, I had to restart my test :x. However, I was able to reproduce the
issue very quickly again with your patch. I've double-checked I'm
booting into the correct kernel, but I do have more load on this
laptop host now, so maybe that made it happen more quickly...
next prev parent reply other threads:[~2013-01-09 8:42 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
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 [this message]
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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