From: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
To: "Hefty, Sean" <sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Cc: Doug Ledford <dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Devesh Sharma
<devesh.sharma-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>,
"linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: [rdma-core v5 0/8] Broadcom User Space RoCE Driver
Date: Tue, 25 Apr 2017 09:28:43 -0600 [thread overview]
Message-ID: <20170425152843.GA17680@obsidianresearch.com> (raw)
In-Reply-To: <1828884A29C6694DAF28B7E6B8A82373AB1169E4-P5GAC/sN6hkd3b2yrw5b5LfspsVTdybXVpNB7YpNyf8@public.gmane.org>
On Mon, Apr 24, 2017 at 11:47:05PM +0000, Hefty, Sean wrote:
> > However, AFAIK, default pthread mutexes well known to be much slower
> > than spinlocks for various cases. They have weird performance aspects
> > from the fairness policy on unlock we may not really want.
> >
> > Perahps this is why Sean open-coded locks using atomics in rdmacm and
> > acm?
>
> I went with open-coded locks based on v-tune (or whatever it's
> called now -- I should really know this) performance analysis and
> benchmarking data. I don't recall the performance gains, but it was
> definitely measureable.
But libfabric uses pthreads?
Jason
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next prev parent reply other threads:[~2017-04-25 15:28 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-24 18:53 [rdma-core v5 0/8] Broadcom User Space RoCE Driver Devesh Sharma
[not found] ` <1493059995-636-1-git-send-email-devesh.sharma-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
2017-04-24 18:53 ` [rdma-core v5 1/8] libbnxt_re: introduce bnxtre user space RDMA provider Devesh Sharma
2017-04-24 18:53 ` [rdma-core v5 2/8] libbnxt_re: Add support for user memory regions Devesh Sharma
2017-04-24 18:53 ` [rdma-core v5 3/8] libbnxt_re: Add support for CQ and QP management Devesh Sharma
2017-04-24 18:53 ` [rdma-core v5 4/8] libbnxt_re: Add support for posting and polling Devesh Sharma
2017-04-24 18:53 ` [rdma-core v5 5/8] libbnxt_re: Allow apps to poll for flushed completions Devesh Sharma
2017-04-24 18:53 ` [rdma-core v5 6/8] libbnxt_re: Enable UD control path and wqe posting Devesh Sharma
2017-04-24 18:53 ` [rdma-core v5 7/8] libbnxt_re: Enable polling for UD completions Devesh Sharma
2017-04-24 18:53 ` [rdma-core v5 8/8] libbnxt_re: Add support for atomic operations Devesh Sharma
2017-04-24 20:57 ` [rdma-core v5 0/8] Broadcom User Space RoCE Driver Doug Ledford
[not found] ` <1493067443.3041.63.camel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2017-04-24 21:51 ` Jason Gunthorpe
[not found] ` <20170424215140.GA14907-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2017-04-24 23:47 ` Hefty, Sean
[not found] ` <1828884A29C6694DAF28B7E6B8A82373AB1169E4-P5GAC/sN6hkd3b2yrw5b5LfspsVTdybXVpNB7YpNyf8@public.gmane.org>
2017-04-25 15:28 ` Jason Gunthorpe [this message]
[not found] ` <20170425152843.GA17680-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2017-04-25 15:35 ` Hefty, Sean
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