Storage Performance Development Kit (SPDK)
 help / color / mirror / Atom feed
From: Kumaraparameshwaran Rathnavel <krath at cloudsimple.com>
To: spdk@lists.01.org
Subject: [SPDK] RDMA Queue Pair
Date: Fri, 30 Jun 2017 18:09:51 +0530	[thread overview]
Message-ID: <A8259ED9-8802-44CB-9E23-BBC464B455FA@cloudsimple.com> (raw)

[-- Attachment #1: Type: text/plain, Size: 582 bytes --]

Hi All,

I would like to get few pointers on how the RDMA is used in NVMf Target . The below statement decides the value of Qdepth of NVMf Qpair.
nvmf_min(max_rw_depth, addr->attr.max_qp_rd_atom and anything more than this will be Queued irrespective of what the upper layer has the Queue depth as. 

And the value for attr.max_qp_rd_atom is got by Querying the device. I see that ideally in most of NICs the value is 16. So does this mean that in a Queue pair there cannot be more RDMA requests than this value.

Please correct me if I am wrong.

Thanking You,
Param.


             reply	other threads:[~2017-06-30 12:39 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-06-30 12:39 Kumaraparameshwaran Rathnavel [this message]
  -- strict thread matches above, loose matches on Subject: below --
2017-06-30 16:07 [SPDK] RDMA Queue Pair Walker, Benjamin
2017-07-01  6:38 Kumaraparameshwaran Rathnavel

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=A8259ED9-8802-44CB-9E23-BBC464B455FA@cloudsimple.com \
    --to=spdk@lists.01.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox