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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.