[lustre-discuss] weird issue w. lnet routers
cfaber at gmail.com
Tue Nov 28 21:03:05 PST 2017
Are peer credits set appropriately across your fabric?
On Nov 28, 2017 8:40 PM, "john casu" <john at chiraldynamics.com> wrote:
> just about to try that MTU setting.
> It's a small lustre system... 2 routers, MDS/MGS pair, OSS pair, JBOD pair
> (112 drives for OST)
> and yes, routing between EDR & 100GbE
> On 11/28/17 7:28 PM, Raj wrote:
>> John, increasing MTU size on Ethernet side should increase the b/w. I
>> also have a feeling that some lnet routers and/or
>> intermediate switches/routers does not have jumbo frame turned on (some
>> switches needs to be set at 9212 bytes ).
>> How many LNet routers are you using? I believe you are routing between
>> EDR IB and 100GbE.
>> On Tue, Nov 28, 2017 at 7:21 PM John Casu <john at chiraldynamics.com
>> <mailto:john at chiraldynamics.com>> wrote:
>> just built a system w. lnet routers that bridge Infiniband & 100GbE,
>> using Centos built in Infiniband support
>> servers are Infiniband, clients are 100GbE (connectx-4 cards)
>> my direct write performance from clients over Infiniband is around
>> When I introduced the lnet routers, performance dropped to 10GB/s
>> Thought the problem was an MTU of 1500, but when I changed the MTUs
>> to 9000
>> performance dropped to 3GB/s.
>> When I tuned according to John Fragella's LUG slides, things went
>> even slower (1.5GB/s write)
>> does anyone have any ideas on what I'm doing wrong??
>> -john c.
>> lustre-discuss mailing list
>> lustre-discuss at lists.lustre.org <mailto:lustre-discuss at lists.l
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