[ofa-general] RE: [ewg] Not seeing any SDP performance changes inOFED 1.3 beta, and I get Oops when enabling sdp_zcopy_thresh
Scott Weitzenkamp (sweitzen)
sweitzen at cisco.com
Sun Jan 6 22:46:58 PST 2008
Jim,
I am trying OFED-1.3-20071231-0600 and RHEL4 x86_64 on a dual CPU
(single core each CPU) Xeon system. I do not see any performance
improvement (either throughput or CPU utilization) using netperf when I
set /sys/module/ib_sdp/sdp_zcopy_thresh to 16384. Can you elaborate on
your HCA type, and performance improvement you see?
Here's an example netperf command line when using a Cheetah DDR HCA and
1.2.917 firmware (I have also tried ConnectX and 2.3.000 firmware too):
[releng at svbu-qa1850-2 ~]$ LD_PRELOAD=libsdp.so netperf241 -v2 -4 -H
192.168.1.201 -l 30 -t TCP_STREAM -c -C -- -m 65536
TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.1.201
(192.168.1.201) port 0 AF_INET : histogram : demo
Recv Send Send Utilization Service
Demand
Socket Socket Message Elapsed Send Recv Send
Recv
Size Size Size Time Throughput local remote local
remote
bytes bytes bytes secs. 10^6bits/s % S % S us/KB
us/KB
87380 16384 65536 30.01 7267.70 55.06 61.27 1.241
1.381
Alignment Offset Bytes Bytes Sends Bytes
Recvs
Local Remote Local Remote Xfered Per Per
Send Recv Send Recv Send (avg) Recv (avg)
8 8 0 0 2.726e+10 65536.00 415942 48106.01
566648
Maximum
Segment
Size (bytes)
-1
Scott Weitzenkamp
SQA and Release Manager
Server Virtualization Business Unit
Cisco Systems
> -----Original Message-----
> From: Jim Mott [mailto:jim at mellanox.com]
> Sent: Wednesday, December 12, 2007 6:29 PM
> To: Scott Weitzenkamp (sweitzen)
> Cc: general at lists.openfabrics.org
> Subject: RE: [ofa-general] RE: [ewg] Not seeing any SDP
> performance changes inOFED 1.3 beta, and I get Oops when
> enabling sdp_zcopy_thresh
>
> I am traveling for the next 2 weeks and not able to test
> anymore. That
> said, I believe all outstanding problems are fixed and it is safe to
> re-enable by default. My testing shows the crossover size
> where bzcopy
> is always a win at about 16K. The patch goes in sdp_main.c and looks
> something like:
> -static int sdp_zcopy_thresh = 0;
> +static int sdp_zcopy_thresh = 16384;
>
> -----Original Message-----
> From: Scott Weitzenkamp (sweitzen) [mailto:sweitzen at cisco.com]
> Sent: Wednesday, December 12, 2007 5:26 PM
> To: Jim Mott; ewg at lists.openfabrics.org
> Cc: general at lists.openfabrics.org
> Subject: RE: [ofa-general] RE: [ewg] Not seeing any SDP performance
> changes inOFED 1.3 beta, and I get Oops when enabling sdp_zcopy_thresh
>
> Jim, when do you plan to enably bzcopy by default?
>
> Scott Weitzenkamp
> SQA and Release Manager
> Server Virtualization Business Unit
> Cisco Systems
>
>
>
>
> > -----Original Message-----
> > From: general-bounces at lists.openfabrics.org
> > [mailto:general-bounces at lists.openfabrics.org] On Behalf Of Jim Mott
> > Sent: Friday, November 30, 2007 12:04 PM
> > To: ewg at lists.openfabrics.org
> > Cc: general at lists.openfabrics.org
> > Subject: [ofa-general] RE: [ewg] Not seeing any SDP
> > performance changes inOFED 1.3 beta, and I get Oops when
> > enabling sdp_zcopy_thresh
> >
> > Hi,
> > This kernel Oops is new and I will look at it. Dotan and
> > the Mellanox regression tests have been keeping me busy
> > recently. There
> > was a problem like this, but only in multi-threaded apps
> > using a single socket or when doing cleanup after ^C.
> >
> > I will re-enable default bzcopy behavior once all the
> > important Mellanox regression tests are passing. Until then,
> > setting the
> > sdp_zcopy_threah variable by hand (8192 and up should give
> > better performance) and running simple tests like netperf should be
> > working fine. You should not be seeing any problem here. [I
> > have only tested locally with x86_64 rhat4u4, rhat5, 2.6.23.8, and
> > 2.6.24-rc2. Mellanox regression tests everything and they
> > have not submitted this Oops yet.]
> >
> > I have opened bugs in the openfabrics bugzilla for
> > everything I am currently working on. It is down right now
> > or I would add
> > pointers.
> >
> >
> > Here is my work list; additions or priority changes welcome:
> >
> > SDP OPEN ISSUES LIST (Priority order)
> > =====================================
> > 1) DONE: BUG: Unload of mlx4 and ib_sdp fails while SDP active
> > 11/6 [PATCH 1/1 V2] SDP - Fix reference count bug ...
> >
> > 2) DONE: BUG: Many data corruption failures
> > 11/11 [PATCH 1/1] SDP - Fix bug where zcopy bcopy returns ...
> >
> > 3) DONE: Bug 793 - kernel BUG at net/core/skbuff.c:95!
> > 11/26 [PATCH 1/1] SDP - bug793; skbuff changes ...
> >
> > 4) TODO: BUG: kernel oops in SDP regression
> > Replicated problem by hitting ^C during a transfer. I have
> > created a patch that fixes the problem, but it needs more work
> > to move into production. There are some side effects I do not
> > yet understand.
> > This is the one I am working on now. I hope to drop it soon.
> > There is a bug open tracking it.
> >
> > 5) TODO: BUG: libsdp returns good RC when it should fail
> >
> > 6) TODO: BUG: aio_test fails in SDP regression
> >
> > 7) TODO: Bug 779 - Lock ordering problem during accept on 1.2.5
> > After building a 2.6.23.8 kernel with lock checking enabled, I
> > can not reproduce this problem. Looks like I'll need more input
> > from the reporter. (Bug updated to say this). I will continue to
> > code review though.
> >
> > 8) DONE: Bug 294 - connect does not allow AF_INET_SDP
> > [fix in bugzilla dropped]
> >
> > 9) DONE: Backport work needed to support 2.6.24
> >
> > 10) TODO: Package user space libsdp for Redhat
> > This is supposed to be easy to do, but it will take me some time
> > to figure out the detail.
> >
> > 11) DONE: BUG: Memory leak
> > 11/20 [PATCH 1/1 v2] SDP - Fix a memory leak in bzcopy
> > -----Original Message-----
> > From: ewg-bounces at lists.openfabrics.org
> > [mailto:ewg-bounces at lists.openfabrics.org] On Behalf Of Scott
> > Weitzenkamp (sweitzen)
> > Sent: Friday, November 30, 2007 12:37 PM
> > To: Jim Mott; Scott Weitzenkamp (sweitzen);
> ewg at lists.openfabrics.org
> > Cc: general at lists.openfabrics.org
> > Subject: [ewg] Not seeing any SDP performance changes in OFED
> > 1.3 beta, and I get Oops when enabling sdp_zcopy_thresh
> >
> > Jim,
> >
> > Using netperf with TCP_STREAM and TCP_RR, I'm not seeing any
> > changes in
> > SDP throughput or CPU utilization comparing OFED 1.3 beta and OFED
> > 1.2.5. Looks like I need to set a non-zero value in
> > /sys/module/ib_sdp/sdp_zcopy_thresh? Do you plan to enable this by
> > default soon?
> >
> > I tried "echo 4096 > /sys/module/ib_sdp/sdp_zcopy_thresh"
> on RHEL4 and
> > then tried netperf, and got an Oops.
> >
> > Unable to handle kernel NULL pointer deref
> > erence at 0000000000000000 RIP:
> > <Nov/30 10:33 am><ffffffff80163ff0>{put_page+0}
> > <Nov/30 10:33 am>PML4 1a3047067 PGD 1a7a6d067 PMD 0
> > <Nov/30 10:33 am>Oops: 0000 [1] SMP
> > <Nov/30 10:33 am>CPU 0
> > <Nov/30 10:33 am>Modules linked in: parport_pc lp parport autofs4
> > i2c_dev i2c_co
> > re nfs lockd nfs_acl sunrpc rdma_ucm(U) rds(U) ib_sdp(U) rdma_cm(U)
> > iw_cm(U) ib_
> > addr(U) mlx4_ib(U) mlx4_core(U) ds yenta_socket pcmcia_core
> dm_mirror
> > dm_multipa
> > th dm_mod joydev button battery ac uhci_hcd ehci_hcd shpchp
> > ib_mthca(U)
> > ib_ipoib
> > (U) ib_umad(U) ib_ucm(U) ib_uverbs(U) ib_cm(U) ib_sa(U) ib_mad(U)
> > ib_core(U) md5
> > ipv6 e1000 floppy ata_piix libata sg ext3 jbd mptscsih
> mptsas mptspi
> > mptscsi mp
> > tbase sd_mod scsi_mod
> > <Nov/30 10:33 am>Pid: 6802, comm: netperf241 Not tainted
> > 2.6.9-55.ELlargesmp
> > <Nov/30 10:33 am>RIP: 0010:[<ffffffff80163ff0>]
> > <ffffffff80163ff0>{put_page+0}
> > <Nov/30 10:33 am>RSP: 0018:00000101a7bcbbc0 EFLAGS: 00010203
> > <Nov/30 10:33 am>RAX: 0000000000000000 RBX: 0000000000000001 RCX:
> > 00000000000002
> > 02
> > <Nov/30 10:33 am>RDX: 00000101b0b43e80 RSI: 0000000000000202 RDI:
> > 00000000000000
> > 00
> > <Nov/30 10:33 am>RBP: 00000101b85761c0 R08: 0000000000000000 R09:
> > 00000000000000
> > 00
> > <Nov/30 10:33 am>R10: 0000000000000246 R11: ffffffffa02e0e36 R12:
> > 00000101a4b330
> > 80
> > <Nov/30 10:33 am>R13: 00000101a7bcbd58 R14: 0000000000000000 R15:
> > 00000000000100
> > 00
> > <Nov/30 10:33 am>FS: 0000002a95696940(0000)
> GS:ffffffff80500380(0000)
> > knlGS:000
> > 0000000000000
> > <Nov/30 10:33 am>CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> > <Nov/30 10:33 am>CR2: 0000000000000000 CR3: 0000000000101000 CR4:
> > 00000000000006
> > e0
> > <Nov/30 10:33 am>Process netperf241 (pid: 6802, threadinfo
> > 00000101a7bca000, tas
> > k 00000101a70df030)
> > <Nov/30 10:33 am>Stack: ffffffffa02e110a 0000000000000100
> > 0000000000000000 00000
> > 00000529780
> > <Nov/30 10:33 am> 0001000000000246 0000000000000246
> > 000000008013feac 00000
> > 800ffffffe0
> > <Nov/30 10:33 am> 0000000000000000 00000101a7bcbe88
> > <Nov/30 10:33 am>Call
> > Trace:<ffffffffa02e110a>{:ib_sdp:sdp_sendmsg+724}
> > <fffffff
> > f801478b2>{queue_delayed_work+101}
> > <Nov/30 10:33 am> <ffffffffa02c6200>{:ib_addr:queue_req+122}
> > <ffffffff802a
> > 7ecb>{sock_sendmsg+271}
> > <Nov/30 10:33 am> <ffffffff80169a61>{do_no_page+916}
> > <ffffffff801359a8>{au
> > toremove_wake_function+0}
> > <Nov/30 10:33 am> <ffffffff802a7c53>{sockfd_lookup+16}
> > <ffffffff802a939a>{
> > sys_sendto+195}
> > <Nov/30 10:33 am> <ffffffff801242b9>{do_page_fault+577}
> > <ffffffff801934c8>
> > {dnotify_parent+34}
> > <Nov/30 10:33 am> <ffffffff80179335>{vfs_read+248}
> > <ffffffff8011026a>{syst
> > em_call+126}
> > <Nov/30 10:33 am>
> >
> > <Nov/30 10:33 am>Code: 8b 07 48 89 fa f6 c4 80 74 3b 48 8b
> 57 10 8b 02
> > 48 89 d1
> > f6
> > <Nov/30 10:33 am>RIP <ffffffff80163ff0>{put_page+0} RSP
> > <00000101a7bcbbc0>
> > <Nov/30 10:33 am>CR2: 0000000000000000
> > <Nov/30 10:33 am> <0>Kernel panic - not syncing: Oops
> >
> > Scott Weitzenkamp
> > SQA and Release Manager
> > Server Virtualization Business Unit
> > Cisco Systems
> > _______________________________________________
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> > ewg at lists.openfabrics.org
> > http://lists.openfabrics.org/cgi-bin/mailman/listinfo/ewg
> >
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