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From: Yann Droneaud <yann-WYdEh2jsUj5Wj0EZb7rXcA@public.gmane.org>
To: "Hefty, Sean" <sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Cc: Eli Cohen <eli-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>,
	"cait-DpaxOq6QOWMAvxtiuMwx3w@public.gmane.org"
	<cait-DpaxOq6QOWMAvxtiuMwx3w@public.gmane.org>,
	"linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: RE: rdma_create_qp() and max_send_wr
Date: Thu, 19 May 2011 17:03:45 +0200	[thread overview]
Message-ID: <1305817426.2359.23.camel@deela.quest-ce.net> (raw)
In-Reply-To: <1305816321.2359.15.camel-H/AUWmsJYVeqvyCYKW+Xr6xOck334EZe@public.gmane.org>

Hi,

Le jeudi 19 mai 2011 à 16:45 +0200, Yann Droneaud a écrit :

> So I'm a bit puzzled : why does it work in ibv_rc_pingpong but not in
> rdma_bw ?
> 

Because ibv_rc_pingpong -r modify the max_recv_wr attributes 
and rdma_bw -t modify the max_send_rw instead.

After modifiying ibv_rc_pingpong to set max_recv_wr attributes, it fails
to create the QP when trying to use more than 16351 WR in the SQ.

To sum up:

- ibv_qp_init_attr.max_recv_wr can be set to ibv_device_attr.max_qp_wr,
16384 in my case,
 
- ibv_qp_init_attr.max_send_wr *cannot* be set to
ibv_device_attr.max_qp_wr, but it can be set to 16351.

Regards.

-- 
Yann Droneaud
OPTEYA


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  parent reply	other threads:[~2011-05-19 15:03 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20110421115323.48b52fb35c6f209c51bccbb9807b6df0.f623dc4952.wbe@email17.secureserver.net>
     [not found] ` <20110421115323.48b52fb35c6f209c51bccbb9807b6df0.f623dc4952.wbe-L1BP6xego3TShzhksYgB+AejPw4fNl8p@public.gmane.org>
2011-04-22 10:20   ` rdma_create_qp() and max_send_wr Yann Droneaud
     [not found]     ` <1303467645.2243.47.camel-H/AUWmsJYVeqvyCYKW+Xr6xOck334EZe@public.gmane.org>
2011-04-22 10:37       ` Yann Droneaud
2011-05-19  6:07       ` Eli Cohen
2011-05-19  9:17         ` Yann Droneaud
     [not found]           ` <1305796637.2359.6.camel-H/AUWmsJYVeqvyCYKW+Xr6xOck334EZe@public.gmane.org>
2011-05-19  9:34             ` Eli Cohen
2011-05-19 10:50               ` Yann Droneaud
     [not found]                 ` <1305802216.2359.11.camel-H/AUWmsJYVeqvyCYKW+Xr6xOck334EZe@public.gmane.org>
2011-05-19 14:25                   ` Hefty, Sean
     [not found]                     ` <1828884A29C6694DAF28B7E6B8A82373FE8B-P5GAC/sN6hmkrb+BlOpmy7fspsVTdybXVpNB7YpNyf8@public.gmane.org>
2011-05-19 14:45                       ` Yann Droneaud
     [not found]                         ` <1305816321.2359.15.camel-H/AUWmsJYVeqvyCYKW+Xr6xOck334EZe@public.gmane.org>
2011-05-19 15:03                           ` Yann Droneaud [this message]
     [not found]                             ` <1305817426.2359.23.camel-H/AUWmsJYVeqvyCYKW+Xr6xOck334EZe@public.gmane.org>
2011-05-19 15:46                               ` Eli Cohen
2011-05-19 16:59                                 ` Yann Droneaud
     [not found]                                   ` <1305824364.2359.37.camel-H/AUWmsJYVeqvyCYKW+Xr6xOck334EZe@public.gmane.org>
2011-05-19 17:13                                     ` Yann Droneaud
2011-05-19 18:06                                     ` Hefty, Sean
     [not found]                                       ` <1828884A29C6694DAF28B7E6B8A82373FF57-P5GAC/sN6hmkrb+BlOpmy7fspsVTdybXVpNB7YpNyf8@public.gmane.org>
2011-05-19 19:37                                         ` Eli Cohen
2011-04-21 16:44 Yann Droneaud
     [not found] ` <1303404264.2243.19.camel-H/AUWmsJYVeqvyCYKW+Xr6xOck334EZe@public.gmane.org>
2011-04-21 18:35   ` Roland Dreier
     [not found]     ` <BANLkTikUOv3mtgb3x_vbbk845_36fu1QhA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-05-22  6:46       ` Or Gerlitz
     [not found]         ` <4DD8B13D.4070802-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2011-05-22  8:21           ` Eli Cohen

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