Yicheng Jia wrote:
Thanks for your reply. I'm using one CQ for all the WRs. Do you know
why there's no ARM-N support in MLX drivers?
I don't know if i can speak in the name of Mellanox/MLX driver
maintainers, but i think that the
reason is lack of demand for this feature (but i can't be sure).
My concern is the performance. The overhead of software poll_cq loop
is quite significant if there are multiple pieces of small amount of
data to be transferred on both sender/receiver sides. For instance, on
the sender, the data I have are 1k, 1k, 2k, 1k..., on the receiver
side, the data size and blocks are the same, 1k, 1k, 2k, 1k.... Do you
have a good solution for such kind of problem?
How many QPs do you use?
(and how outstanding WR from every QP?)
Dotan
Best,
Yicheng
*Dotan Barak <[EMAIL PROTECTED]>*
05/23/2008 01:27 PM
To
Yicheng Jia <[EMAIL PROTECTED]>
cc
[email protected]
Subject
Re: [ofa-general] MLX HCA: CQ request notification for multiple
completions not implemented?
Hi.
Yicheng Jia wrote:
>
> Hi Folks,
>
> I'm trying to use CQ Event notification for multiple completions
> (ARM_N) according to Mellanox Lx III user manual for scatter/gathering
> RDMA. However I couldn't find it in current MLX driver. It seems to me
> that only ARM_NEXT and ARM_SOLICIT are implemented. So if there are
> multiple work requests, I have to use "poll_cq" to synchronously wait
> until all the requests are done, is it correct? Is there a way to do
> asynchronous multiple send by subscribing for a ARM_N event?
You are right: the low level drivers of Mellanox devices doesn't support
ARM-N
(This feature is supported by the devices, but it wasn't implemented in
the low level drivers).
You are right, in order to read all of the completions you need to use
poll_cq.
By the way: Do you have you have to create a completion for any WR?
(if you are using one QP, this will maybe solve your problem).
Dotan
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