From: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
To: Christoph Lameter <cl-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org>
Cc: Doug Ledford <dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Or Gerlitz <gerlitz.or-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
Or Gerlitz <ogerlitz-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>,
"linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: [PATCH] Expire sendonly joins (was Re: [PATCH rdma-rc 0/2] Add mechanism for ipoib neigh state change notifications)
Date: Mon, 28 Sep 2015 11:36:46 -0600 [thread overview]
Message-ID: <20150928173646.GA1453@obsidianresearch.com> (raw)
In-Reply-To: <alpine.DEB.2.20.1509281217470.31260-wcBtFHqTun5QOdAKl3ChDw@public.gmane.org>
On Mon, Sep 28, 2015 at 12:19:04PM -0500, Christoph Lameter wrote:
> > Christoph's needs would probably be better served by giving some API
> > to control the mlid cache (ie the neightbour table is already 99% of
> > the way there). This would let some userspace component pre-load and
> > fix all relevant data and undesired cache activity simply can't add
> > jitter.
>
> Ok so on boot up we preload 3000 multicast groups into the neighbor table?
> What impact on IB performance would having such a number of mlid's in the
> cache have?
What is the cost of a neighbour lookup? Isn't it hashed? So not very
much if the hash function/table size work well with the distribution
of IPs.
The win is any send to any of the 3000 groups is consistent in all
cases, no outlier that is slower due to the SA turn around.
Jason
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next prev parent reply other threads:[~2015-09-28 17:36 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-17 10:38 [PATCH rdma-rc 0/2] Add mechanism for ipoib neigh state change notifications Or Gerlitz
[not found] ` <1442486283-9699-1-git-send-email-ogerlitz-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2015-09-17 10:38 ` [PATCH rdma-rc 1/2] IB/ipoib: " Or Gerlitz
2015-09-17 10:38 ` [PATCH rdma-rc 2/2] IB/ipoib: Add cleanup to sendonly multicast objects Or Gerlitz
[not found] ` <1442486283-9699-3-git-send-email-ogerlitz-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2015-09-17 11:19 ` Or Gerlitz
2015-09-17 14:42 ` [PATCH rdma-rc 0/2] Add mechanism for ipoib neigh state change notifications Christoph Lameter
[not found] ` <alpine.DEB.2.11.1509170940270.2052-wcBtFHqTun5QOdAKl3ChDw@public.gmane.org>
2015-09-17 18:55 ` Or Gerlitz
2015-09-17 18:57 ` Or Gerlitz
[not found] ` <CAJ3xEMg-h+J=cr2ddWvYUGU=MOBk4Aw-KtkeJutATH0Y17dnjg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-09-24 17:00 ` [PATCH] Expire sendonly joins (was Re: [PATCH rdma-rc 0/2] Add mechanism for ipoib neigh state change notifications) Christoph Lameter
[not found] ` <alpine.DEB.2.20.1509241158420.21198-wcBtFHqTun5QOdAKl3ChDw@public.gmane.org>
2015-09-25 15:32 ` Or Gerlitz
[not found] ` <CAJ3xEMg2qQ3CXrfTrg=gUX2tQRuPnpxA-8PC98GzoF5iz=j5PQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-09-25 16:41 ` Christoph Lameter
[not found] ` <alpine.DEB.2.20.1509251140200.31792-wcBtFHqTun5QOdAKl3ChDw@public.gmane.org>
2015-09-25 16:55 ` Christoph Lameter
2015-09-26 17:35 ` Or Gerlitz
[not found] ` <CAJ3xEMj9kGaM6s+AqBQ_-ZTB_+cgDk3kefhq_O0V3PM120O9yQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-09-27 16:39 ` Christoph Lameter
[not found] ` <alpine.DEB.2.20.1509271136570.14486-wcBtFHqTun5QOdAKl3ChDw@public.gmane.org>
2015-09-27 17:32 ` Doug Ledford
[not found] ` <5608282F.1020507-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2015-09-28 2:28 ` Christoph Lameter
[not found] ` <alpine.DEB.2.20.1509272120090.18678-wcBtFHqTun5QOdAKl3ChDw@public.gmane.org>
2015-09-28 15:36 ` Doug Ledford
[not found] ` <56095E6B.60509-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2015-09-28 15:51 ` Christoph Lameter
[not found] ` <alpine.DEB.2.20.1509281046440.30710-wcBtFHqTun5QOdAKl3ChDw@public.gmane.org>
2015-09-28 16:59 ` Doug Ledford
[not found] ` <560971DC.500-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2015-09-28 17:05 ` Christoph Lameter
2015-09-28 17:11 ` Christoph Lameter
2015-09-28 17:10 ` Jason Gunthorpe
[not found] ` <20150928171007.GE12415-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2015-09-28 17:19 ` Christoph Lameter
[not found] ` <alpine.DEB.2.20.1509281217470.31260-wcBtFHqTun5QOdAKl3ChDw@public.gmane.org>
2015-09-28 17:36 ` Jason Gunthorpe [this message]
2015-09-29 17:47 ` Doug Ledford
2015-09-28 6:37 ` Or Gerlitz
[not found] ` <CAJ3xEMg5aC8oeBVA9qygVJyLd2GM9C4sVLZqAL=kFGBcgBq_oQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-09-28 11:17 ` Christoph Lameter
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