[Lustre-discuss] lnet router tuning

Eric Barton eeb at whamcloud.com
Mon Sep 13 03:08:40 PDT 2010


 

Michael,

 

 

How are you generating load and measuring the throughput?   I’m particularly interested in the number

of nodes on each side of the router and how many messages you have in flight between each one.

 

 

Cheers,
                   Eric 

 

 

 

 

From: lustre-discuss-bounces at lists.lustre.org [mailto:lustre-discuss-bounces at lists.lustre.org] On Behalf Of Michael Kluge
Sent: 11 September 2010 12:56 AM
To: Michael Kluge
Cc: Lustre Diskussionsliste
Subject: Re: [Lustre-discuss] lnet router tuning

 

And here are my params:

 

root at doss05:/home/tests/lnet# for F in /sys/module/lnet/parameters/* ; do echo -n "$F: "; cat $F ; done

/sys/module/lnet/parameters/accept: secure

/sys/module/lnet/parameters/accept_backlog: 127

/sys/module/lnet/parameters/accept_port: 988

/sys/module/lnet/parameters/accept_timeout: 5

/sys/module/lnet/parameters/auto_down: 1

/sys/module/lnet/parameters/avoid_asym_router_failure: 0

/sys/module/lnet/parameters/check_routers_before_use: 0

/sys/module/lnet/parameters/config_on_load: 0

/sys/module/lnet/parameters/dead_router_check_interval: 0

/sys/module/lnet/parameters/forwarding: enabled

/sys/module/lnet/parameters/ip2nets: 

/sys/module/lnet/parameters/large_router_buffers: 512

/sys/module/lnet/parameters/live_router_check_interval: 0

/sys/module/lnet/parameters/local_nid_dist_zero: 1

/sys/module/lnet/parameters/networks: tcp0(eth2),o2ib(ib1)

/sys/module/lnet/parameters/peer_buffer_credits: 0

/sys/module/lnet/parameters/portals_compatibility: none

/sys/module/lnet/parameters/router_ping_timeout: 50

/sys/module/lnet/parameters/routes: 

/sys/module/lnet/parameters/small_router_buffers: 8192

/sys/module/lnet/parameters/tiny_router_buffers: 1024

 

I have not used ip2nets but configure routing but put explict routing statements into the modprobe.d/ files. Is that OK? 

 

 

Michael

 

 

Am 10.09.2010 um 17:48 schrieb Michael Kluge:





OK, IB back to back is at 1,2 GB/s, 10GE back to back at 950 MB/s, with additional lnet router I see 550 MB/s. Time for lnet tuning?

 

Michael





Hi Andreas,

 

Am 10.09.2010 um 16:35 schrieb Andreas Dilger:





On 2010-09-10, at 08:23, Michael Kluge wrote:



I have a Lustre 1.8.3 setup where I'd like to some lnet router performance tests with routing between DDR IB<->10GE networks.
Currently I have three nodes, one with DDR IB, one with 10GE and one with both that does the routing. A first short lnet test shows
520-550 MB/s performance. 

 

Has anyone an idea which of the variables of the lnet module are worth playing with to get this number a bit closer to 1GB/s? 


I would start by testing the performance on just the 10GigE side, and then separately on the IB side, to verify you are getting the
expected performance from the components before trying them both together.  Often it is necessary to tune the ethernet send/receive
buffers.

 

Ethernet back to back is at 950 MB/s. I have not looked at IB back to back yet.

 

 

Michael


-- 

Michael Kluge, M.Sc.

Technische Universität Dresden
Center for Information Services and
High Performance Computing (ZIH)
D-01062 Dresden
Germany

Contact:
Willersbau, Room WIL A 208
Phone:  (+49) 351 463-34217
Fax:    (+49) 351 463-37773
e-mail: michael.kluge at tu-dresden.de
WWW:    http://www.tu-dresden.de/zih

 

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Lustre-discuss mailing list
Lustre-discuss at lists.lustre.org
http://lists.lustre.org/mailman/listinfo/lustre-discuss

 


-- 

Michael Kluge, M.Sc.

Technische Universität Dresden
Center for Information Services and
High Performance Computing (ZIH)
D-01062 Dresden
Germany

Contact:
Willersbau, Room WIL A 208
Phone:  (+49) 351 463-34217
Fax:    (+49) 351 463-37773
e-mail: michael.kluge at tu-dresden.de
WWW:    http://www.tu-dresden.de/zih

 

_______________________________________________
Lustre-discuss mailing list
Lustre-discuss at lists.lustre.org
http://lists.lustre.org/mailman/listinfo/lustre-discuss

 


-- 

Michael Kluge, M.Sc.

Technische Universität Dresden
Center for Information Services and
High Performance Computing (ZIH)
D-01062 Dresden
Germany

Contact:
Willersbau, Room WIL A 208
Phone:  (+49) 351 463-34217
Fax:    (+49) 351 463-37773
e-mail: michael.kluge at tu-dresden.de
WWW:    http://www.tu-dresden.de/zih

 

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