From: Sagi Grimberg <sagi-NQWnxTmZq1alnMjI0IkVqw@public.gmane.org>
To: Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
Cc: Christoph Lameter <cl-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org>,
Leon Romanovsky <leon-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Chuck Lever <chuck.lever-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>,
Bart Van Assche
<bart.vanassche-XdAiOPVOjttBDgjK7y7TUQ@public.gmane.org>,
Yishai Hadas
<yishaih-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>,
Yishai Hadas <yishaih-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>,
linux-rdma <linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Or Gerlitz <ogerlitz-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>,
Joonsoo Kim <iamjoonsoo.kim-Hm3cg6mZ9cc@public.gmane.org>,
Haggai Eran <haggaie-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>,
Majd Dibbiny <majd-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Subject: Re: RDMA Read: Local protection error
Date: Sun, 29 May 2016 11:13:50 +0300 [thread overview]
Message-ID: <574AA4BE.2060207@grimberg.me> (raw)
In-Reply-To: <20160529071749.GB24347-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
>> Really? It's used all over the stack...
>>
>> So the suggestion is to restrict the allocation does not
>> cross the page boundary (which can easily be done with making
>> MLX4_MR_PAGES_ALIGN be PAGE_SIZE or larger than PAGE_SIZE/2)?
>
> We could simply switch to alloc_pages, e.g. something like the patch below:
Patch below? :)
> But I have to admit I really like the coherent dma mapping version,
> for all sane architectures that works much better, although it sucks
> for some architetures where dma coherent mappings cause a bit of
> overhead.
But this is specific to mlx4 which supports up 511 pages per MR, mlx5
will need a coherent allocation anyways right (it supports up to 64K
pages per MR)?
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next prev parent reply other threads:[~2016-05-29 8:13 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-29 16:24 RDMA Read: Local protection error Chuck Lever
[not found] ` <1A4F4C32-CE5A-44D9-9BFE-0E1F8D5DF44D-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2016-04-29 16:44 ` Santosh Shilimkar
[not found] ` <3fb4e75f-ff14-34e2-b6d3-6b6046812845-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2016-04-29 16:58 ` Chuck Lever
[not found] ` <72E8335B-282B-4DCC-AE4F-FE7E50ED5A08-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2016-04-29 19:07 ` Santosh Shilimkar
2016-04-29 16:45 ` Bart Van Assche
[not found] ` <57238F8C.70505-XdAiOPVOjttBDgjK7y7TUQ@public.gmane.org>
2016-04-29 17:02 ` Chuck Lever
2016-04-29 17:34 ` Laurence Oberman
2016-05-02 15:10 ` Chuck Lever
[not found] ` <B72A389F-FFF1-498C-A946-8AA72B7769F8-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2016-05-02 16:08 ` Bart Van Assche
[not found] ` <57277B63.8030506-XdAiOPVOjttBDgjK7y7TUQ@public.gmane.org>
2016-05-03 14:57 ` Chuck Lever
[not found] ` <6BBFD126-877C-4638-BB91-ABF715E29326-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2016-05-04 1:07 ` Joonsoo Kim
2016-05-04 19:59 ` Chuck Lever
[not found] ` <F6C79393-6174-49B3-ADBB-E40627DEE85D-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2016-05-09 1:03 ` Joonsoo Kim
[not found] ` <CAAmzW4NbY3Og0BgQyeA4LLXTnMuPTjxVUdFbH+HLahBw+MAhsw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-05-09 1:15 ` Chuck Lever
[not found] ` <1A79DEDE-A5C3-4581-A0AE-7C0AB056B4C7-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2016-05-09 2:11 ` Joonsoo Kim
2016-05-25 15:58 ` Chuck Lever
[not found] ` <1AFD636B-09FC-4736-B1C5-D1D9FA0B97B0-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2016-05-26 16:24 ` Yishai Hadas
[not found] ` <8a3276bf-f716-3dca-9d54-369fc3bdcc39-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2016-05-26 16:30 ` Bart Van Assche
[not found] ` <aaa67d51-663a-0aba-fc54-a5ab5d947a55-XdAiOPVOjttBDgjK7y7TUQ@public.gmane.org>
2016-05-26 16:34 ` Chuck Lever
[not found] ` <C0AE237D-5E5A-4F94-B717-F3A3B4B4D4A8-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2016-05-26 16:48 ` Sagi Grimberg
[not found] ` <574728EC.9040802-NQWnxTmZq1alnMjI0IkVqw@public.gmane.org>
2016-05-26 17:19 ` Sagi Grimberg
[not found] ` <57473025.5020801-NQWnxTmZq1alnMjI0IkVqw@public.gmane.org>
2016-05-26 17:57 ` Chuck Lever
2016-05-26 19:23 ` Leon Romanovsky
[not found] ` <20160526192351.GV25500-2ukJVAZIZ/Y@public.gmane.org>
2016-05-26 20:12 ` Christoph Lameter
[not found] ` <alpine.DEB.2.20.1605261511230.8857-wcBtFHqTun5QOdAKl3ChDw@public.gmane.org>
2016-05-29 7:02 ` Sagi Grimberg
[not found] ` <574A941D.9050404-NQWnxTmZq1alnMjI0IkVqw@public.gmane.org>
2016-05-29 7:17 ` Christoph Hellwig
[not found] ` <20160529071749.GB24347-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2016-05-29 8:13 ` Sagi Grimberg [this message]
[not found] ` <574AA4BE.2060207-NQWnxTmZq1alnMjI0IkVqw@public.gmane.org>
2016-05-29 8:15 ` Christoph Hellwig
[not found] ` <20160529081527.GA5839-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2016-05-29 8:37 ` Sagi Grimberg
2016-05-31 15:14 ` Christoph Lameter
2016-05-29 7:10 ` Christoph Hellwig
[not found] ` <20160529071040.GA24347-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2016-05-29 8:56 ` Leon Romanovsky
2016-05-26 20:10 ` Christoph Lameter
2016-05-26 16:39 ` Leon Romanovsky
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