From: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
To: "Davis, Arlin R" <arlin.r.davis-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Cc: "Hefty,
Sean" <sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
linux-rdma <linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"ofw-ZwoEplunGu1OwGhvXhtEPSCwEArCW2h5@public.gmane.org"
<ofw-ZwoEplunGu1OwGhvXhtEPSCwEArCW2h5@public.gmane.org>
Subject: Re: [PATCH] DAPL v2.0: common: increase default IB ack timer from 16 to 20
Date: Wed, 2 Nov 2011 20:28:22 -0600 [thread overview]
Message-ID: <20111103022822.GA6674@obsidianresearch.com> (raw)
In-Reply-To: <54347E5A035A054EAE9D05927FB467F916E931E8-P5GAC/sN6hmkrb+BlOpmy7fspsVTdybXVpNB7YpNyf8@public.gmane.org>
On Wed, Nov 02, 2011 at 11:31:38PM +0000, Davis, Arlin R wrote:
> > > Yes, a user can modify path lifetime via rdma_create_ep() but there
> > > is no way for the user to know how much that will be manipulated and
> > > increased in the IB CM driver.
> >
> > Sure there is. It's an open source driver. :)
> >
> > The ib_cm calculates the "correct" timeout based on the packet lifetime
> > provided by the SA and the CA ack timeout. If user modifications to
> > this value are necessary, then there is a bug in either the SA or HCA
> > driver.
>
> or there could be congestion on the fabric that the SA or HCA driver
> is unaware of.
That is what packet life time is supposed to model, and the policy
knob for it belongs in the SA, not every app..
Jason
--
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:[~2011-11-03 2:28 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-02 21:35 [PATCH] DAPL v2.0: common: increase default IB ack timer from 16 to 20 Davis, Arlin R
[not found] ` <54347E5A035A054EAE9D05927FB467F916E93128-P5GAC/sN6hmkrb+BlOpmy7fspsVTdybXVpNB7YpNyf8@public.gmane.org>
2011-11-02 22:40 ` Hefty, Sean
[not found] ` <1828884A29C6694DAF28B7E6B8A8237316E8CBCB-P5GAC/sN6hmkrb+BlOpmy7fspsVTdybXVpNB7YpNyf8@public.gmane.org>
2011-11-02 23:09 ` Davis, Arlin R
[not found] ` <54347E5A035A054EAE9D05927FB467F916E931C5-P5GAC/sN6hmkrb+BlOpmy7fspsVTdybXVpNB7YpNyf8@public.gmane.org>
2011-11-02 23:19 ` Hefty, Sean
2011-11-02 23:31 ` Davis, Arlin R
[not found] ` <54347E5A035A054EAE9D05927FB467F916E931E8-P5GAC/sN6hmkrb+BlOpmy7fspsVTdybXVpNB7YpNyf8@public.gmane.org>
2011-11-03 2:28 ` Jason Gunthorpe [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=20111103022822.GA6674@obsidianresearch.com \
--to=jgunthorpe-epgobjl8dl3ta4ec/59zmfatqe2ktcn/@public.gmane.org \
--cc=arlin.r.davis-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org \
--cc=linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
--cc=ofw-ZwoEplunGu1OwGhvXhtEPSCwEArCW2h5@public.gmane.org \
--cc=sean.hefty-ral2JQCrhuEAvxtiuMwx3w@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