From: Hal Rosenstock <hal.rosenstock-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: "Hefty, Sean" <sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Cc: Hari Subramoni
<subramon-wPOY3OvGL++pAIv7I8X2sze48wsgrGvP@public.gmane.org>,
linux-rdma <linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: Setting ACK timeout for QP's created using RDMA_CM.
Date: Fri, 29 Jan 2010 11:57:05 -0500 [thread overview]
Message-ID: <f0e08f231001290857k37c5f891tbb730d22aabc3075@mail.gmail.com> (raw)
In-Reply-To: <CF9C39F99A89134C9CF9C4CCB68B8DDF12D589ABB6-osO9UTpF0USkrb+BlOpmy7fspsVTdybXVpNB7YpNyf8@public.gmane.org>
On Fri, Jan 29, 2010 at 11:43 AM, Hefty, Sean <sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org> wrote:
>>uint8_t timeout; /* Local ack timeout for primary path (valid only for RC
>>QPs)*/
>>
>>I believe that this is the period of time (in seconds) that the IB HCA
>>will wait for the ACK for a packet it sent out before re-transmitting? I
>>was looking as to whether this field can be modified when creating a QP
>>using RDMA_CM.
>
> This field is set based on the packet lifetime carried in the path record. If you're using opensm, there's probably a configuration option that can adjust this (subnet timeout, maybe?).
Yes, OpenSM returns subnet_timeout as the SA PathRecord PacketLifeTime
assuming it's not loopback and no QoS set.
-- Hal
> The time given for the QP attribute is in 'IB time': 4.096 x 2 ^ timeout micro-seconds.
>
> - Sean
> --
> To unsubscribe from this list: send the line "unsubscribe linux-rdma" in
> the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
--
To unsubscribe from this list: send the line "unsubscribe linux-rdma" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
prev parent reply other threads:[~2010-01-29 16:57 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-29 14:35 Setting ACK timeout for QP's created using RDMA_CM Hari Subramoni
[not found] ` <Pine.GSO.4.40.1001290933060.4760-100000-ItQMRKI8FOvVp4Hyp30HIZ9NZdITTVap@public.gmane.org>
2010-01-29 16:43 ` Hefty, Sean
[not found] ` <CF9C39F99A89134C9CF9C4CCB68B8DDF12D589ABB6-osO9UTpF0USkrb+BlOpmy7fspsVTdybXVpNB7YpNyf8@public.gmane.org>
2010-01-29 16:50 ` Hari Subramoni
2010-01-29 16:57 ` Hal Rosenstock [this message]
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=f0e08f231001290857k37c5f891tbb730d22aabc3075@mail.gmail.com \
--to=hal.rosenstock-re5jqeeqqe8avxtiumwx3w@public.gmane.org \
--cc=linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
--cc=sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org \
--cc=subramon-wPOY3OvGL++pAIv7I8X2sze48wsgrGvP@public.gmane.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;
as well as URLs for NNTP newsgroup(s).