From mboxrd@z Thu Jan  1 00:00:00 1970
From: Hal Rosenstock <hal-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
Subject: Re: Slow performance with librspreload.so
Date: Tue, 03 Sep 2013 08:06:53 -0400
Message-ID: <5225D0DD.7060803@dev.mellanox.co.il>
References: <CAJH6TXgf2LeMH+1L290w_KZ5tTN7NWpQxntF58Z506G3h_qKVw@mail.gmail.com> <1828884A29C6694DAF28B7E6B8A8237388CA96AD@ORSMSX109.amr.corp.intel.com> <CAJH6TXhAuSDytS5O1cJMg3iatq+STkwhPUG2zmexJ5tmt3Foqg@mail.gmail.com> <1828884A29C6694DAF28B7E6B8A8237388CA9865@ORSMSX109.amr.corp.intel.com> <CAJH6TXgA0ghKX1P8UUAMFKY9o0xBJ0j4-kFa_M4a4ecdzoD0HA@mail.gmail.com> <1828884A29C6694DAF28B7E6B8A8237388CA9C6B@ORSMSX109.amr.corp.intel.com> <CAJH6TXiYLKt3b1UFsZt7uFwDbWcDFnHNnS8CTO24Gt-2zn+Qiw@mail.gmail.com> <1828884A29C6694DAF28B7E6B8A8237388CA9D8A@ORSMSX109.amr.corp.intel.com> <CAJH6TXhWWMBbopDLZY2+rrNOm2m5gcmObj7Sr16u2qrNW_NHgw@mail.gmail.com> <CAJH6TXgR=wVGyyHrpTKkBw-5M=A9-tGzjpYcV6NWpk8uKvFn8Q@mail.gmail.com> <1828884A29C6694DAF28B7E6B8A8237388CAA11B@ORSMSX109.amr.corp.intel.com> <CAJH6TXgu4L8g
 nqQX1fKZ=ioZDxUMnj=s3h0qkYh1_35VWpMJ1g@mail.gmail.com> <000c01cea63e$1e20eae0$5a62c0a0$@soft-forge.com> <CAJH6TXiOToa2-EOj6Hz-rkVHt3tCSh4jnLbKZs69GhT7dFeH0A@mail.gmail.com>
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To: Gandalf Corvotempesta <gandalf.corvotempesta-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: Rupert Dance <rsdance-rzwDkyJvnYokmLvzuZlaBw@public.gmane.org>, "Hefty, Sean" <sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>, "linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" <linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
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On 8/31/2013 3:51 PM, Gandalf Corvotempesta wrote:
> By the way, increasing MTU to 4096 will give me more performance?

With mthca, due to quirk, optimal performance is achieved at 1K MTU.
OpenSM can reduce the MTU in returned PathRecords to 1K when one end of
the path is mthca and actual path MTU is > 1K. This is controlled by
enable_quirks config parameter which defaults to FALSE (don't do this).

-- Hal
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