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From: Jonas Pfefferle <pepperjo at japf.ch>
To: spdk@lists.01.org
Subject: Re: [SPDK] Controller Memory Buffer
Date: Sun, 11 Mar 2018 12:31:59 +0100	[thread overview]
Message-ID: <ximss-47968587@switchplus-mail.ch> (raw)
In-Reply-To: D37E9B71-5724-4A84-A2F2-9B9D2D11129D@raithlin.com

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Hi Stephen,

Thanks for the hints. Do you happen to know which Intel drives these are? I 
have a few Intel drives: DC P3600/3700 and 900p/P4800X but neither of those 
devices have CMB.

I'm experimenting with Mellanox ConnectX-5 target offloading so it would be 
nice to see the effects of having SQ/CQ and data staging on the device. From 
the experiments I've done so far it looks like the latencies are higher with 
the offloaded target compared to SPDK or the Kernel target. I assume this is 
partially due to the additional PCIe round trip times.

Thanks & Cheers,
Jonas

  On Sat, 10 Mar 2018 21:11:01 +0000
  "Stephen  Bates" <sbates(a)raithlin.com> wrote:
> Jonas
> 
> There are some Intel drives that include a small (a few MB) CMB that 
>supports SQS only. Both Eideticom and Everspin have NVMe devices that 
>have CMBs that support the WDS and RDS modes as well as SQS.
> 
> I know that other vendors are pretty actively looking at this so I’d 
>expect more NVMe SSDs with a variety of CMB modes later this year. 
>I’d suggest pinging those companies and getting roadmap updates from 
>them to understand their timelines.
> 
> Cheers
> 
> Stephen
> 
>> On Mar 9, 2018, at 9:15 AM, Jonas Pfefferle <pepperjo(a)japf.ch> 
>>wrote:
>> 
>> Hi @all,
>> 
>> Is there any NVMe drive available which supports the optional 
>>"Controller Memory Buffer" feature introduced in NVMe 1.2?
>> 
>> Thanks & Regards,
>> Jonas
>> 
>> _______________________________________________
>> SPDK mailing list
>> SPDK(a)lists.01.org
>> https://lists.01.org/mailman/listinfo/spdk
> _______________________________________________
> SPDK mailing list
> SPDK(a)lists.01.org
> https://lists.01.org/mailman/listinfo/spdk



             reply	other threads:[~2018-03-11 11:31 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-11 11:31 Jonas Pfefferle [this message]
  -- strict thread matches above, loose matches on Subject: below --
2018-03-12 16:20 [SPDK] Controller Memory Buffer Harris, James R
2018-03-12 13:14 Stephen Bates
2018-03-10 21:11 Stephen Bates
2018-03-09 16:15 Jonas Pfefferle

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