From mboxrd@z Thu Jan  1 00:00:00 1970
From: Gandalf Corvotempesta <gandalf.corvotempesta-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: Re: Slow performance with librspreload.so
Date: Sat, 31 Aug 2013 11:20:44 +0200
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To: Rupert Dance <rsdance-rzwDkyJvnYokmLvzuZlaBw@public.gmane.org>
Cc: "Hefty, Sean" <sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>, "linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" <linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
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2013/8/30 Rupert Dance <rsdance-rzwDkyJvnYokmLvzuZlaBw@public.gmane.org>:
> One way to set or check mtu is with the ibportstate utility:
>
> Usage: ibportstate [options] <dest dr_path|lid|guid> <portnum> [<op>]
> Supported ops: enable, disable, reset, speed, width, query, down, arm,
> active, vls, mtu, lid, smlid, lmc

I've tried but max MTU is 2048 on one device:

$ sudo ibv_devinfo
hca_id: mthca0
transport: InfiniBand (0)
fw_ver: 4.7.600
node_guid: 0008:f104:0398:14cc
sys_image_guid: 0008:f104:0398:14cf
vendor_id: 0x08f1
vendor_part_id: 25208
hw_ver: 0xA0
board_id: VLT0040010001
phys_port_cnt: 2
port: 1
state: PORT_ACTIVE (4)
max_mtu: 2048 (4)
active_mtu: 2048 (4)
sm_lid: 1
port_lid: 2
port_lmc: 0x00
link_layer: InfiniBand

any workaround? Maybe a firmware update ?
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