Date:	Fri, 12 Sep 2008 18:43:23 -0400
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Ian Campbell <ijc@...lion.org.uk>
Cc:	Tom Tucker <tom@...ngridcomputing.com>,
	Trond Myklebust <trond.myklebust@....uio.no>,
	John Ronciak <john.ronciak@...il.com>,
	Grant Coady <gcoady.lk@...il.com>,
	linux-kernel@...r.kernel.org, neilb@...e.de,
	linux-nfs@...r.kernel.org,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Bruce Allan <bruce.w.allan@...el.com>,
	PJ Waskiewicz <peter.p.waskiewicz.jr@...el.com>,
	John Ronciak <john.ronciak@...el.com>,
	e1000-devel@...ts.sourceforge.net
Subject: Re: NFS regression? Odd delays and lockups accessing an NFS export.

On Wed, Sep 10, 2008 at 09:40:15AM +0100, Ian Campbell wrote:
> On Mon, 2008-09-01 at 12:20 -0500, Tom Tucker wrote: 
> > Ian Campbell wrote:
> > > On Sun, 2008-08-31 at 14:51 -0500, Tom Tucker wrote:
> > >   
> > >> Looks like you ran this on the client. Sorry, Ian, I should have been
> > >> more specific. You need to modify the rpc_debug file on the server.
> > >>     
> > >
> > > I tried this on the server but it's pretty crippling (the server is
> > > quite weedy, 300MHz K3 or something).
> > >
> > > I'll leave it logging overnight since things should be pretty quiet (and
> > > that's often when the problem occurs) but if there's a less aggressive
> > > setting than 256 but which would still be useful I could leave it on
> > > permanently until the problem happens.
> > >
> > >   
> > Thanks Ian. Unfortunately, that's as fine grained as it gets. 256 
> > (0x100) is the bit for transport logging.
> 
> Still no repro with the debugging enabled I'm afraid.
> 
> I'm wondering if the performance hit makes it unlikely to trigger since
> everything slows to a crawl. I haven't been able to leave it on 24/7
> since it makes all the NFS clients nearly unusable but I've had it on
> overnight and when there's no one around etc, which is when the hang
> generally seems to occur.

OK, thanks for the attempt.  We should figure out how to tone down those
dprintk's.

I'll try to take a closer look at this, but I'm travelling starting
tomorrow, and realistically may not find time to look at this for a
couple weeks.  If someone else gets to it before me, great....

--b.

> 
> I forgot to re-enable it one evening and, perhaps inevitably, it crashed
> overnight. I turned the debugging on and captured the following. It's
> not much since syslog had given up for some reason, probably when the
> disk filled up with logs. 192.168.1.5 is a non-problematic client so I
> don't think the log will be useful since the problematic client
> (192.168.1.4) isn't mentioned..
> 
> Ian.
> 
> vc: socket ee5fd600 recvfrom(ee5fd764, 0) = 4
> [4009900.094587] svc: TCP record, 140 bytes
> [4009900.098604] svc: socket ee5fd600 recvfrom(e996b08c, 3956) = 140
> [4009900.102587] svc: TCP complete record (140 bytes)
> [4009900.106592] svc: transport ee5fd600 put into queue
> [4009900.110613] svc: got len=140
> [4009900.114645] svc: transport ee5fd600 busy, not enqueued
> [4009900.118752] svc: socket ee5fd600 sendto([dfbb0000 232... ], 232) = 232 (addr 192.168.1.5, port=910)
> [4009900.122636] svc: socket c1888960 TCP data ready (svsk ee5fd600)
> [4009900.126588] svc: transport ee5fd600 busy, not enqueued
> [4009900.130601] svc: transport ee5fd600 busy, not enqueued
> [4009900.134593] svc: server eefc4000 waiting for data (to = 900000)
> [4009900.162711] svc: transport ee5fd600 dequeued, inuse=1
> [4009900.166598] svc: server eef4a000, pool 0, transport ee5fd600, inuse=2
> [4009900.170594] svc: tcp_recv ee5fd600 data 1 conn 0 close 0
> [4009900.174611] svc: socket ee5fd600 recvfrom(ee5fd764, 0) = 4
> [4009900.178592] svc: TCP record, 136 bytes
> [4009900.182606] svc: socket ee5fd600 recvfrom(e975a088, 3960) = 136
> [4009900.186592] svc: TCP complete record (136 bytes)
> [4009900.190599] svc: transport ee5fd600 put into queue
> [4009900.194605] svc: got len=136
> [4009900.198632] svc: transport ee5fd600 busy, not enqueued
> [4009900.202717] svc: socket ee5fd600 sendto([d6464000 124... ], 124) = 124 (addr 192.168.1.5, port=910)
> [4009900.206664] svc: socket c1888960 TCP data ready (svsk ee5fd600)
> [4009900.210594] svc: transport ee5fd600 busy, not enqueued
> [4009900.214611] svc: transport ee5fd600 busy, not enqueued
> [4009900.218599] svc: server eef4a000 waiting for data (to = 900000)
> [4009900.254640] svc: transport ee5fd600 dequeued, inuse=1
> [4009900.258603] svc: server ee978000, pool 0, transport ee5fd600, inuse=2
> [4009900.262601] svc: tcp_recv ee5fd600 data 1 conn 0 close 0
> [4009900.266625] svc: socket ee5fd600 recvfrom(ee5fd764, 0) = 4
> [4009900.270598] svc: TCP record, 128 bytes
> [4009900.274618] svc: socket ee5fd600 recvfrom(dd54d080, 3968) = 128
> [4009900.278598] svc: TCP complete record (128 bytes)
> [4009900.282605] svc: transport ee5fd600 put into queue
> [4009900.286611] svc: got len=128
> [4009900.290642] svc: transport ee5fd600 busy, not enqueued
> [4009900.294788] svc: socket ee5fd600 sendto([efb5c000 116... ], 116) = 116 (addr 192.168.1.5, port=910)
> [4009900.298707] svc: socket c1888960 TCP data ready (svsk ee5fd600)
> [4009900.302600] svc: transport ee5fd600 busy, not enqueued
> [4009900.306622] svc: transport ee5fd600 busy, not enqueued
> [4009900.310604] svc: server ee978000 waiting for data (to = 900000)
> [4009900.346682] svc: transport ee5fd600 dequeued, inuse=1
> [4009900.350609] svc: server ee8fe000, pool 0, transport ee5fd600, inuse=2
> [4009900.354606] svc: tcp_recv ee5fd600 data 1 conn 0 close 0
> [4009900.358626] svc: socket ee5fd600 recvfrom(ee5fd764, 0) = 4
> [4009900.362603] svc: TCP record, 148 bytes
> [4009900.366622] svc: socket ee5fd600 recvfrom(eec92094, 3948) = 148
> [4009900.370604] svc: TCP complete record (148 bytes)
> [4009900.374612] svc: transport ee5fd600 put into queue
> [4009900.378610] svc: got len=148
> [4009900.382652] svc: transport ee5fd600 busy, not enqueued
> [4009900.386829] svc: socket ee5fd600 sendto([e98bf000 232... ], 232) = 232 (addr 192.168.1.5, port=910)
> [4009900.390688] svc: socket c1888960 TCP data ready (svsk ee5fd600)
> [4009900.394606] svc: transport ee5fd600 busy, not enqueued
> [4009900.398621] svc: transport ee5fd600 busy, not enqueued
> [4009900.402611] svc: server ee8fe000 waiting for data (to = 900000)
> [4009900.438683] svc: transport ee5fd600 dequeued, inuse=1
> [4009900.442614] svc: server eef12000, pool 0, transport ee5fd600, inuse=2
> [4009900.446612] svc: tcp_recv ee5fd600 data 1 conn 0 close 0
> [4009900.450634] svc: socket ee5fd600 recvfrom(ee5fd764, 0) = 4
> [4009900.454609] svc: TCP record, 156 bytes
> [4009900.458631] svc: socket ee5fd600 recvfrom(dd78509c, 3940) = 156
> [4009900.462692] svc: TCP complete record (156 bytes)
> [4009900.466693] svc: transport ee5fd600 put into queue
> [4009900.470610] svc: got len=156
> [4009900.474657] svc: transport ee5fd600 busy, not enqueued
> [4009900.478801] svc: socket ee5fd600 sendto([ee92b000 232... ], 232) = 232 (addr 192.168.1.5, port=910)
> [4009900.482696] svc: socket c1888960 TCP data ready (svsk ee5fd600)
> [4009900.486611] svc: transport ee5fd600 busy, not enqueued
> [4009900.490630] svc: transport ee5fd600 busy, not enqueued
> [4009900.494617] svc: server eef12000 waiting for data (to = 900000)
> [4009900.522817] svc: transport ee5fd600 dequeued, inuse=1
> [4009900.526622] svc: server ee9f2000, pool 0, transport ee5fd600, inuse=2
> [4009900.530617] svc: tcp_recv ee5fd600 data 1 conn 0 close 0
> [4009900.534639] svc: socket ee5fd600 recvfrom(ee5fd764, 0) = 4
> [4009900.538615] svc: TCP record, 124 bytes
> [4009900.542632] svc: socket ee5fd600 recvfrom(e977007c, 3972) = 124
> [4009900.546615] svc: TCP complete record (124 bytes)
> [4009900.550621] svc: transport ee5fd600 put into queue
> [4009900.554616] svc: got len=124
> [4009900.558656] svc: transport ee5fd600 busy, not enqueued
> [4009900.562766] svc: socket ee5fd600 sendto([dd5e1000 124... ], 124) = 124 (addr 192.168.1.5, port=910)
> [4009900.566724] svc: transport ee5fd600 busy, not enqueued
> [4009900.570622] svc: server ee9f2000 waiting for data (to = 900000)
> [4009900.607202] svc: transport ee5fd600 dequeued, inuse=1
> [4009900.610629] svc: server eeeb7000, pool 0, transport ee5fd600, inuse=2
> [4009900.614623] svc: tcp_recv ee5fd600 data 1 conn 0 close 0
> [4009900.618647] svc: socket ee5fd600 recvfrom(ee5fd764, 0) = 4
> [4009900.622619] svc: TCP record, 124 bytes
> [4009900.626641] svc: socket ee5fd600 recvfrom(e971607c, 3972) = 124
> [4009900.630620] svc: TCP complete record (124 bytes)
> [4009900.634630] svc: transport ee5fd600 put into queue
> [4009900.638621] svc: got len=124
> [4009900.642661] svc: transport ee5fd600 busy, not enqueued
> [4009900.646760] svc: socket ee5fd600 sendto([e95ee000 124... ], 124) = 124 (addr 192.168.1.5, port=910)
> [4009900.650734] svc: socket c1888960 TCP data ready (svsk ee5fd600)
> [4009900.654622] svc: transport ee5fd600 busy, not enqueued
> [4009900.658640] svc: transport ee5fd600 busy, not enqueued
> [4009900.662626] svc: server eeeb7000 waiting for data (to = 900000)
> [4009900.691707] svc: transport ee5fd600 dequeued, inuse=1
> [4009900.694637] svc: server eef31000, pool 0, transport ee5fd600, inuse=2
> [4009900.698628] svc: tcp_recv ee5fd600 data 1 conn 0 close 0
> [4009900.702646] svc: socket ee5fd600 recvfrom(ee5fd764, 0) = 4
> [4009900.706625] svc: TCP record, 156 bytes
> [4009900.710654] svc: socket ee5fd600 recvfrom(e99b009c, 3940) = 156
> [4009900.714626] svc: TCP complete record (156 bytes)
> [4009900.718632] svc: transport ee5fd600 put into queue
> [4009900.722626] svc: got len=156
> [4009900.725731] svc: transport ee5fd600 busy, not enqueued
> [4009900.726797] svc: socket ee5fd600 sendto([e9bee000 232... ], 232) = 232 (addr 192.168.1.5, port=910)
> [4009900.730717] svc: socket c1888960 TCP data ready (svsk ee5fd600)
> [4009900.734627] svc: transport ee5fd600 busy, not enqueued
> [4009900.738646] svc: transport ee5fd600 busy, not enqueued
> [4009900.742631] svc: server eef31000 waiting for data (to = 900000)
> [4009900.778691] svc: transport ee5fd600 dequeued, inuse=1
> [4009900.782635] svc: server eefc4000, pool 0, transport ee5fd600, inuse=2
> [4009900.786633] svc: tcp_recv ee5fd600 data 1 conn 0 close 0
> [4009900.790649] svc: socket ee5fd600 recvfrom(ee5fd764, 0) = 4
> [4009900.794631] svc: TCP record, 144 bytes
> [4009900.798663] svc: socket ee5fd600 recvfrom(e996b090, 3952) = 144
> [4009900.802632] svc: TCP complete record (144 bytes)
> [4009900.806638] svc: transport ee5fd600 put into queue
> [4009900.810632] svc: got len=144
> [4009900.814675] svc: transport ee5fd600 busy, not enqueued
> [4009900.818858] svc: socket ee5fd600 sendto([dfbb0000 232... ], 232) = 232 (addr 192.168.1.5, port=910)
> [4009900.822707] svc: socket c1888960 TCP data ready (svsk ee5fd600)
> [4009900.826632] svc: transport ee5fd600 busy, not enqueued
> [4009900.830647] svc: transport ee5fd600 busy, not enqueued
> [4009900.834638] svc: server eefc4000 waiting for data (to = 900000)
> [4009900.862781] svc: transport ee5fd600 dequeued, inuse=1
> [4009900.866647] svc: server eef4a000, pool 0, transport ee5fd600, inuse=2
> [4009900.870644] svc: tcp_recv ee5fd600 data 1 conn 0 close 0
> [4009900.874651] svc: socket ee5fd600 recvfrom(ee5fd764, 0) = 4
> [4009900.878636] svc: TCP record, 136 bytes
> [4009900.882649] svc: socket ee5fd600 recvfrom(e975a088, 3960) = 136
> [4009900.886636] svc: TCP complete record (136 bytes)
> [4009900.890642] svc: transport ee5fd600 put into queue
> [4009900.894654] svc: got len=136
> [4009900.898678] svc: transport ee5fd600 busy, not enqueued
> [4009900.902761] svc: socket ee5fd600 sendto([d6464000 124... ], 124) = 124 (addr 192.168.1.5, port=910)
> [4009900.906714] svc: socket c1888960 TCP data ready (svsk ee5fd600)
> [4009900.910638] svc: transport ee5fd600 busy, not enqueued
> [4009900.914654] svc: transport ee5fd600 busy, not enqueued
> [4009900.918643] svc: server eef4a000 waiting for data (to = 900000)
> [4009900.954826] svc: transport ee5fd600 dequeued, inuse=1
> [4009900.958648] svc: server ee978000, pool 0, transport ee5fd600, inuse=2
> [4009900.962645] svc: tcp_recv ee5fd600 data 1 conn 0 close 0
> [4009900.966667] svc: socket ee5fd600 recvfrom(ee5fd764, 0) = 4
> [4009900.970642] svc: TCP record, 140 bytes
> [4009900.974659] svc: socket ee5fd600 recvfrom(dd54d08c, 3956) = 140
> [4009900.978652] svc: TCP complete record (140 bytes)
> [4009900.982649] svc: transport ee5fd600 put into queue
> [4009900.986642] svc: got len=140
> [4009900.990686] svc: transport ee5fd600 busy, not enqueued
> [4009900.994848] svc: socket ee5fd600 sendto([efb5c000 232... ], 232) = 232 (addr 192.168.1.5, port=910)
> [4009900.998725] svc: socket c1888960 TCP data ready (svsk ee5fd600)
> [4009901.002644] svc: transport ee5fd600 busy, not enqueued
> [4009901.006662] svc: transport ee5fd600 busy, not enqueued
> [4009901.010648] svc: server ee978000 waiting for data (to = 900000)
> [4009901.046694] svc: transport ee5fd600 dequeued, inuse=1
> [4009901.050652] svc: server ee8fe000, pool 0, transport ee5fd600, inuse=2
> [4009901.054650] svc: tcp_recv ee5fd600 data 1 conn 0 close 0
> [4009901.058666] svc: socket ee5fd600 recvfrom(ee5fd764, 0) = 4
> [4009901.062647] svc: TCP record, 156 bytes
> [4009901.066669] svc: socket ee5fd600 recvfrom(eec9209c, 3940) = 156
> [4009901.070648] svc: TCP complete record (156 bytes)
> [4009901.074655] svc: transport ee5fd600 put into queue
> [4009901.078648] svc: got len=156
> [4009901.082688] svc: transport ee5fd600 busy, not enqueued
> [4009901.086844] svc: socket ee5fd600 sendto([e98bf000 232... ], 232) = 232 (addr 192.168.1.5, port=910)
> [4009901.090750] svc: socket c1888960 TCP data ready (svsk ee5fd600)
> [4009901.094650] svc: transport ee5fd600 busy, not enqueued
> [4009901.098671] svc: transport ee5fd600 busy, not enqueued
> [4009901.102655] svc: server ee8fe000 waiting for data (to = 900000)
> [4009901.138700] svc: transport ee5fd600 dequeued, inuse=1
> [4009901.142658] svc: server ee9f2000, pool 0, transport ee5fd600, inuse=2
> [4009901.146656] svc: tcp_recv ee5fd600 data 1 conn 0 close 0
> [4009901.150678] svc: socket ee5fd600 recvfrom(ee5fd764, 0) = 4
> [4009901.154654] svc: TCP record, 124 bytes
> [4009901.158671] svc: socket ee5fd600 recvfrom(e977007c, 3972) = 124
> [4009901.162654] svc: TCP complete record (124 bytes)
> [4009901.166659] svc: transport ee5fd600 put into queue
> [4009901.170654] svc: got len=124
> [4009901.174694] svc: transport ee5fd600 busy, not enqueued
> [4009901.178811] svc: socket ee5fd600 sendto([dd67d000 124... ], 124) = 124 (addr 192.168.1.5, port=910)
> [4009901.182741] svc: socket c1888960 TCP data ready (svsk ee5fd600)
> [4009901.186655] svc: transport ee5fd600 busy, not enqueued
> [4009901.190673] svc: transport ee5fd600 busy, not enqueued
> [4009901.194661] svc: server ee9f2000 waiting for data (to = 900000)
> [4009901.222747] svc: transport ee5fd600 dequeued, inuse=1
> [4009901.226690] svc: server eef12000, pool 0, transport ee5fd600, inuse=2
> [4009901.230661] svc: tcp_recv ee5fd600 data 1 conn 0 close 0
> [4009901.234677] svc: socket ee5fd600 recvfrom(ee5fd764, 0) = 4
> [4009901.238658] svc: TCP record, 152 bytes
> [4009901.242673] svc: socket ee5fd600 recvfrom(dd785098, 3944) = 152
> [4009901.246659] svc: TCP complete record (152 bytes)
> [4009901.250664] svc: transport ee5fd600 put into queue
> [4009901.254659] svc: got len=152
> [4009901.258700] svc: transport ee5fd600 busy, not enqueued
> [4009901.262809] svc: socket ee5fd600 sendto([ee92b000 232... ], 232) = 232 (addr 192.168.1.5, port=910)
> [4009901.266734] svc: socket c1888960 TCP data ready (svsk ee5fd600)
> [4009901.270660] svc: transport ee5fd600 busy, not enqueued
> [4009901.274677] svc: transport ee5fd600 busy, not enqueued
> [4009901.278665] svc: server eef12000 waiting for data (to = 900000)
> [4009901.314692] svc: transport ee5fd600 dequeued, inuse=1
> [4009901.318668] svc: server eeeb7000, pool 0, transport ee5fd600, inuse=2
> [4009901.322667] svc: tcp_recv ee5fd600 data 1 conn 0 close 0
> [4009901.326682] svc: socket ee5fd600 recvfrom(ee5fd764, 0) = 4
> [4009901.330664] svc: TCP record, 156 bytes
> [4009901.334681] svc: socket ee5fd600 recvfrom(e971609c, 3940) = 156
> [4009901.338665] svc: TCP complete record (156 bytes)
> [4009901.342672] svc: transport ee5fd600 put into queue
> [4009901.346665] svc: got len=156
> [4009901.350707] svc: transport ee5fd600 busy, not enqueued
> [4009901.354849] svc: socket ee5fd600 sendto([e95ee000 232... ], 232) = 232 (addr 192.168.1.5, port=910)
> [4009901.358747] svc: socket c1888960 TCP data ready (svsk ee5fd600)
> [4009901.362666] svc: transport ee5fd600 busy, not enqueued
> [4009901.366683] svc: transport ee5fd600 busy, not enqueued
> [4009901.370672] svc: server eeeb7000 waiting for data (to = 900000)
> [4009901.406725] svc: transport ee5fd600 dequeued, inuse=1
> [4009901.410674] svc: server eef31000, pool 0, transport ee5fd600, inuse=2
> [4009901.414672] svc: tcp_recv ee5fd600 data 1 conn 0 close 0
> [4009901.418691] svc: socket ee5fd600 recvfrom(ee5fd764, 0) = 4
> [4009901.422670] svc: TCP record, 136 bytes
> [4009901.426690] svc: socket ee5fd600 recvfrom(e99b0088, 3960) = 136
> [4009901.430671] svc: TCP complete record (136 bytes)
> [4009901.434677] svc: transport ee5fd600 put into queue
> [4009901.438684] svc: got len=136
> [4009901.442710] svc: transport ee5fd600 busy, not enqueued
> [4009901.446878] svc: socket ee5fd600 sendto([e9bee000 124... ], 124) = 124 (addr 192.168.1.5, port=910)
> [4009901.450767] svc: socket c1888960 TCP data ready (svsk ee5fd600)
> [4009901.454672] svc: transport ee5fd600 busy, not enqueued
> [4009901.458754] svc: transport ee5fd600 busy, not enqueued
> [4009901.462690] svc: server eef31000 waiting for data (to = 900000)
> [4009901.499151] svc: transport ee5fd600 dequeued, inuse=1
> [4009901.502687] svc: server eefc4000, pool 0, transport ee5fd600, inuse=2
> [4009901.506679] svc: tcp_recv ee5fd600 data 1 conn 0 close 0
> [4009901.510698] svc: socket ee5fd600 recvfrom(ee5fd764, 0) = 4
> [4009901.514675] svc: TCP record, 140 bytes
> [4009901.518694] svc: socket ee5fd600 recvfrom(e996b08c, 3956) = 140
> [4009901.522676] svc: TCP complete record (140 bytes)
> [4009901.526683] svc: transport ee5fd600 put into queue
> [4009901.530676] svc: got len=140
> [4009901.534716] svc: transport ee5fd600 busy, not enqueued
> [4009901.542824] svc: socket ee5fd600 sendto([dfbb0000 232... ], 232) = 232 (addr 192.168.1.5, port=910)
> [4009901.546806] svc: socket c1888960 TCP data ready (svsk ee5fd600)
> [4009901.550678] svc: transport ee5fd600 busy, not enqueued
> [4009901.554700] svc: transport ee5fd600 busy, not enqueued
> [4009901.558682] svc: server eefc4000 waiting for data (to = 900000)
> 
> 
> -- 
> Ian Campbell
> 
> GIVE:	Support the helpless victims of computer error.
> 
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