From: Roland Dreier <rdreier-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org>
To: Werther Pirani <wpirani-hv++7WL8WN4@public.gmane.org>
Cc: linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: Documentation for libiverbs?
Date: Thu, 14 Jan 2010 09:23:41 -0800 [thread overview]
Message-ID: <ada7hrkmwgy.fsf@roland-alpha.cisco.com> (raw)
In-Reply-To: <4B4EEAFC.5040409-hv++7WL8WN4@public.gmane.org> (Werther Pirani's message of "Thu, 14 Jan 2010 09:59:24 +0000")
> I understand things correctly, means the only option is Unreliable
> Datagrams.
Yes.
> I'm experimenting with ud_pingpong.c and it works, but as soon as a
> try to exchange messages bigger than 2048 bytes I have the following
> error:
>
> Failed status local length error (1) for wr_id 2
>
> A table in Mellanox' "RDMA Aware Networks Programming" shows that for
> UDs the max messages size is limited by the MTU. That really being the
> case, how can I check/change the it?
UD messages are limited to a single packet. The packet MTU is a
hardware/fabric property, and it is quite likely that 2048 is the
maximum for your fabric.
- R.
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next prev parent reply other threads:[~2010-01-14 17:23 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <S1752421Ab0AMJqp/20100113094645Z+1609@vger.kernel.org>
[not found] ` <S1752421Ab0AMJqp/20100113094645Z+1609-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
2010-01-13 10:06 ` Documentation for libiverbs? Werther Pirani
[not found] ` <4B4D9B1E.1020604-hv++7WL8WN4@public.gmane.org>
2010-01-13 11:44 ` Tziporet Koren
[not found] ` <4B4DB219.2020406-VPRAkNaXOzVS1MOuV/RT9w@public.gmane.org>
2010-01-14 9:59 ` Werther Pirani
[not found] ` <4B4EEAFC.5040409-hv++7WL8WN4@public.gmane.org>
2010-01-14 17:23 ` Roland Dreier [this message]
2010-01-13 18:09 ` Bryan Green
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