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From: Roland Dreier <rdreier-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org>
To: Or Gerlitz <ogerlitz-smomgflXvOZWk0Htik3J/w@public.gmane.org>
Cc: David Dillow <dillowda-1Heg1YXhbW8@public.gmane.org>,
	linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [RFC 0/8] Reliably generate large request from SRP
Date: Thu, 20 Jan 2011 09:50:36 -0800	[thread overview]
Message-ID: <adad3nrwjkj.fsf@cisco.com> (raw)
In-Reply-To: <4D3805C4.6010203-smomgflXvOZWk0Htik3J/w@public.gmane.org> (Or Gerlitz's message of "Thu, 20 Jan 2011 11:52:04 +0200")

 > Roland, I wasn't sure to follow if the usage of the FMRs ala the IB spec, 
 > which are supported by mlx4 you were suggesting came to address the bugs
 > or the features... 

I just have a general preference for using the fast mem reg through a
work queue (from BMME), since that is cleaner (eg allows deterministic
unmap with local invalidate work requests, instead of having possibly
still valid FMRs floating around until the batched invalidate happens)
and also what all future devices should support, instead of having hacks
to support the old legacy FMRs.

It's not a problem for SRP (since that's really IB-only) but also I
would expect iWARP devices to have better support for mem reg through
work queues, so anything transport agnostic is better off avoiding FMRs.

 - R.
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  parent reply	other threads:[~2011-01-20 17:50 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-01-19  4:27 [RFC 0/8] Reliably generate large request from SRP David Dillow
     [not found] ` <1295411242-26148-1-git-send-email-dillowda-1Heg1YXhbW8@public.gmane.org>
2011-01-19  4:27   ` [RFC 1/8] IB/srp: always avoid non-zero offsets into an FMR David Dillow
2011-01-19  4:27   ` [RFC 2/8] IB/srp: move IB CM setup completion into its own function David Dillow
2011-01-19  4:27   ` [RFC 3/8] IB/srp: allow sg_tablesize to be set for each target David Dillow
2011-01-19  4:27   ` [RFC 4/8] IB/srp: rework mapping engine to use multiple FMR entries David Dillow
     [not found]     ` <1295411242-26148-5-git-send-email-dillowda-1Heg1YXhbW8@public.gmane.org>
2011-01-20 10:04       ` Or Gerlitz
     [not found]         ` <AANLkTim6H063ta0w2A+zo9QH0jY5qL5uu1OxN4iqMFEm-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-01-20 12:36           ` David Dillow
2011-01-19  4:27   ` [RFC 5/8] IB/srp: add safety valve for large SG tables without HW support David Dillow
2011-01-19  4:27   ` [RFC 6/8] IB/srp: add support for indirect tables that don't fit in SRP_CMD David Dillow
2011-01-19  4:27   ` [RFC 7/8] IB/srp: try to use larger FMR sizes to cover our mappings David Dillow
     [not found]     ` <1295411242-26148-8-git-send-email-dillowda-1Heg1YXhbW8@public.gmane.org>
2011-01-20 10:24       ` Or Gerlitz
     [not found]         ` <4D380D4B.6060404-smomgflXvOZWk0Htik3J/w@public.gmane.org>
2011-01-20 12:40           ` David Dillow
2011-01-19  4:27   ` [RFC 8/8] IB/srp and direct IO: patches for testing large indirect tables David Dillow
     [not found]     ` <1295411242-26148-9-git-send-email-dillowda-1Heg1YXhbW8@public.gmane.org>
2011-01-20 10:07       ` Or Gerlitz
     [not found]         ` <4D38094B.9090101-smomgflXvOZWk0Htik3J/w@public.gmane.org>
2011-01-20 12:33           ` David Dillow
2011-01-19  5:31   ` [RFC 0/8] Reliably generate large request from SRP Roland Dreier
     [not found]     ` <aday66hxxwe.fsf-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org>
2011-01-19 12:01       ` David Dillow
2011-01-20  9:52       ` Or Gerlitz
     [not found]         ` <4D3805C4.6010203-smomgflXvOZWk0Htik3J/w@public.gmane.org>
2011-01-20 12:54           ` David Dillow
     [not found]             ` <1295528044.22825.64.camel-1q1vX8mYZiGLUyTwlgNVppKKF0rrzTr+@public.gmane.org>
2011-01-24 15:32               ` Or Gerlitz
     [not found]                 ` <4D3D9B74.8090607-smomgflXvOZWk0Htik3J/w@public.gmane.org>
2011-01-24 16:14                   ` Bart Van Assche
     [not found]                     ` <AANLkTikapxELx5B6knAm6CQaeLsKHWd9EMQeexmFdF1Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-01-24 18:00                       ` David Dillow
2011-01-24 17:53                   ` David Dillow
2011-01-20 17:50           ` Roland Dreier [this message]
2011-02-19  0:06       ` David Dillow
2011-02-19  0:07       ` David Dillow
     [not found]         ` <1298074037.15679.17.camel-FqX9LgGZnHWDB2HL1qBt2PIbXMQ5te18@public.gmane.org>
2011-02-22  6:36           ` Or Gerlitz
     [not found]             ` <4D635974.10807-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2011-02-22 14:49               ` David Dillow
     [not found]                 ` <1298386190.18945.1.camel-1q1vX8mYZiGLUyTwlgNVppKKF0rrzTr+@public.gmane.org>
2011-02-22 23:38                   ` Roland Dreier
     [not found]                     ` <AANLkTikxDu5b=p4fXHMm8W+tF3Lru4vB7xRZEF+HDpyu-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-02-23  1:23                       ` David Dillow
     [not found] ` <1300148888.2772.15.camel@lap75545.ornl.gov>
     [not found]   ` <AANLkTinC9QcE8E_O3M0+dapVGEAZq_tw-3cb3GN4qf-q@mail.gmail.com>
     [not found]     ` <AANLkTinC9QcE8E_O3M0+dapVGEAZq_tw-3cb3GN4qf-q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-03-15 23:51       ` David Dillow
     [not found]   ` <1300148888.2772.15.camel-FqX9LgGZnHWDB2HL1qBt2PIbXMQ5te18@public.gmane.org>
2011-03-16  8:27     ` Or Gerlitz
     [not found]       ` <4D807472.2060000-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2011-03-16 15:07         ` David Dillow
2011-03-16 16:50         ` Roland Dreier
     [not found]           ` <AANLkTimY74Wmsfc3F35SBuR2YyDW=ao78B=9uGh4LZNJ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-03-16 21:41             ` David Dillow

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