From: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
To: Doug Ledford <dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: Matan Barak
<matanb-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>,
Or Gerlitz <ogerlitz-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>,
linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Amir Vadai <amirv-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>,
Tal Alon <talal-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Subject: Re: [PATCH for-next V2 0/9] Add completion timestamping support
Date: Mon, 1 Jun 2015 11:29:29 -0600 [thread overview]
Message-ID: <20150601172929.GA17715@obsidianresearch.com> (raw)
In-Reply-To: <1433178057.114391.208.camel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
On Mon, Jun 01, 2015 at 01:00:57PM -0400, Doug Ledford wrote:
> > case for this feature, generalizing too much may destroy the
> > performance that is valuable here.
> I'm not convinced of that. Steve has already spoke up about the
> timestamps available in cxgb4. Those are very different and yet still
> highly valuable to someone investigating performance of their RDMA
> application.
? cxgb4 looks nearly identical to me. There is only one HW time stamp
'cqe_sge_ts', which occurs at some point in the flow, and is written
the CQE. The current cycle counter can be read from SGE_TIMESTAMP_LO
registers. Same as mlx4, really.
The rest is just bookkeeping and logging that doesn't require special
verbs support for an app to implement.
Jason
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next prev parent reply other threads:[~2015-06-01 17:29 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-31 12:14 [PATCH for-next V2 0/9] Add completion timestamping support Or Gerlitz
[not found] ` <1433074457-26437-1-git-send-email-ogerlitz-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2015-05-31 12:14 ` [PATCH for-next V2 1/9] IB/core: Change provider's API of create_cq to be extendible Or Gerlitz
[not found] ` <1433074457-26437-2-git-send-email-ogerlitz-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2015-06-01 9:21 ` Devesh Sharma
2015-06-01 17:00 ` Jason Gunthorpe
2015-05-31 12:14 ` [PATCH for-next V2 2/9] IB/core: Change ib_create_cq to use struct ib_cq_init_attr Or Gerlitz
[not found] ` <1433074457-26437-3-git-send-email-ogerlitz-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2015-06-01 16:53 ` Jason Gunthorpe
[not found] ` <20150601165335.GB14391-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2015-06-02 7:29 ` Matan Barak
[not found] ` <CAAKD3BAyNpEKwM7xu=LzFo2F=qP=EN9ZteL2yyAgBVuPNmvtqA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-06-02 17:27 ` Jason Gunthorpe
[not found] ` <20150602172711.GB17776-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2015-06-03 9:04 ` Matan Barak
[not found] ` <CAAKD3BA7ZD4Gx5c16Ak+0_64rzazw+7n4frkuKHyrvdT=8ac6w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-06-03 16:02 ` Jason Gunthorpe
2015-05-31 12:14 ` [PATCH for-next V2 3/9] IB/core: Add CQ creation time-stamping flag Or Gerlitz
2015-05-31 12:14 ` [PATCH for-next V2 4/9] IB/core: Extend ib_uverbs_create_cq Or Gerlitz
2015-05-31 12:14 ` [PATCH for-next V2 5/9] IB/core: Add timestamp_mask and hca_core_clock to query_device Or Gerlitz
2015-05-31 12:14 ` [PATCH for-next V2 6/9] IB/core: Pass hardware specific data in query_device Or Gerlitz
[not found] ` <1433074457-26437-7-git-send-email-ogerlitz-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2015-06-01 9:24 ` Devesh Sharma
2015-05-31 12:14 ` [PATCH for-next V2 7/9] IB/mlx4: Add mmap call to map the hardware clock Or Gerlitz
2015-05-31 12:14 ` [PATCH for-next V2 8/9] IB/mlx4: Support extended create_cq and query_device uverbs Or Gerlitz
[not found] ` <1433074457-26437-9-git-send-email-ogerlitz-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2015-06-01 16:56 ` Jason Gunthorpe
[not found] ` <20150601165649.GC14391-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2015-06-02 7:21 ` Matan Barak
[not found] ` <CAAKD3BBsTFYKwOBK+6u04x6deRYzjYESJzbpyy83UtoChZhpOA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-06-02 17:07 ` Jason Gunthorpe
[not found] ` <20150602170736.GA17776-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2015-06-03 8:57 ` Matan Barak
[not found] ` <CAAKD3BARPocK1zZ2nYV0xWHqEASJTYbp1aQxwymi-TYTyK_vGA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-06-03 16:31 ` Jason Gunthorpe
[not found] ` <20150603163146.GD12073-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2015-06-03 18:58 ` Or Gerlitz
[not found] ` <CAJ3xEMhGdX-35WAjauKZE7+Wg39kbXP35UzYX33J6OB8g_9rYA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-06-03 19:16 ` Jason Gunthorpe
[not found] ` <20150603191609.GB7902-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2015-06-03 19:35 ` Or Gerlitz
[not found] ` <CAJ3xEMiPkxf_Qu40AozMRWZaY-dAfEyAOZGyT9VYsNpQO1Q-Zw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-06-03 20:38 ` Jason Gunthorpe
2015-05-31 12:14 ` [PATCH for-next V2 9/9] IB/mlx4: Add support for CQ time-stamping Or Gerlitz
2015-05-31 12:31 ` [PATCH for-next V2 0/9] Add completion timestamping support Or Gerlitz
2015-05-31 19:00 ` Doug Ledford
[not found] ` <1433098827.114391.179.camel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2015-06-01 9:30 ` Matan Barak
[not found] ` <CAAKD3BBo9A5AV9Uv-q1TgSQ6hs-oSUn5QsUT+5+6mk1RwW7AUA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-06-01 11:25 ` Doug Ledford
[not found] ` <1433157904.114391.188.camel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2015-06-01 13:58 ` Christoph Lameter
[not found] ` <alpine.DEB.2.11.1506010852360.26845-wcBtFHqTun5QOdAKl3ChDw@public.gmane.org>
2015-06-01 16:39 ` Doug Ledford
2015-06-01 16:43 ` Jason Gunthorpe
[not found] ` <20150601164322.GA14391-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2015-06-01 17:00 ` Doug Ledford
[not found] ` <1433178057.114391.208.camel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2015-06-01 17:29 ` Jason Gunthorpe [this message]
2015-06-02 14:35 ` Doug Ledford
[not found] ` <1433255724.114391.225.camel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2015-06-02 14:44 ` Or Gerlitz
[not found] ` <556DC167.5070205-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2015-06-02 14:53 ` Doug Ledford
2015-06-02 18:08 ` Jason Gunthorpe
[not found] ` <20150602180844.GD17776-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2015-06-02 18:51 ` Doug Ledford
[not found] ` <1433271083.40123.1.camel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2015-06-02 19:04 ` Jason Gunthorpe
[not found] ` <20150602190410.GA23362-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2015-06-02 19:56 ` Doug Ledford
2015-06-03 19:48 ` Or Gerlitz
[not found] ` <CAJ3xEMjZqwJC8=HrMBv_eSVKVtLW7qjVZNjtuD28octGPtYu6w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-06-03 20:46 ` Jason Gunthorpe
[not found] ` <20150603204633.GE7902-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2015-06-04 0:55 ` Christoph Lameter
[not found] ` <alpine.DEB.2.11.1506031953500.11879-wcBtFHqTun5QOdAKl3ChDw@public.gmane.org>
2015-06-04 4:25 ` Jason Gunthorpe
[not found] ` <20150604042540.GA8837-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2015-06-06 8:16 ` Christoph Lameter
[not found] ` <alpine.DEB.2.11.1506060304480.29634-wcBtFHqTun5QOdAKl3ChDw@public.gmane.org>
2015-06-06 15:45 ` Doug Ledford
[not found] ` <1433605546.40123.217.camel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2015-06-06 20:25 ` Or Gerlitz
2015-06-07 4:42 ` Jason Gunthorpe
2015-06-07 4:49 ` Christoph Lameter
2015-06-04 16:17 ` Hefty, Sean
[not found] ` <1828884A29C6694DAF28B7E6B8A82373A8FE4F16-P5GAC/sN6hkd3b2yrw5b5LfspsVTdybXVpNB7YpNyf8@public.gmane.org>
2015-06-04 16:47 ` Jason Gunthorpe
[not found] ` <20150604164759.GC27699-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2015-06-04 17:24 ` Hefty, Sean
[not found] ` <1828884A29C6694DAF28B7E6B8A82373A8FE4F98-P5GAC/sN6hkd3b2yrw5b5LfspsVTdybXVpNB7YpNyf8@public.gmane.org>
2015-06-06 8:27 ` Christoph Lameter
[not found] ` <alpine.DEB.2.11.1506060318570.29860-wcBtFHqTun5QOdAKl3ChDw@public.gmane.org>
2015-06-08 16:40 ` Hefty, Sean
[not found] ` <1828884A29C6694DAF28B7E6B8A82373A8FE5AB8-P5GAC/sN6hkd3b2yrw5b5LfspsVTdybXVpNB7YpNyf8@public.gmane.org>
2015-06-10 1:26 ` Christoph Lameter
[not found] ` <alpine.DEB.2.11.1506092018190.6681-wcBtFHqTun5QOdAKl3ChDw@public.gmane.org>
2015-06-10 8:45 ` Or Gerlitz
[not found] ` <5577F93F.9030405-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2015-06-10 23:54 ` Doug Ledford
2015-06-10 16:04 ` Hefty, Sean
[not found] ` <1828884A29C6694DAF28B7E6B8A82373A8FE6746-P5GAC/sN6hkd3b2yrw5b5LfspsVTdybXVpNB7YpNyf8@public.gmane.org>
2015-06-11 15:24 ` Christoph Lameter
[not found] ` <alpine.DEB.2.11.1506111010580.18426-wcBtFHqTun5QOdAKl3ChDw@public.gmane.org>
2015-06-11 19:48 ` Hefty, Sean
2015-06-04 17:30 ` Doug Ledford
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