[Intel-wired-lan] CMA alloc failed with 6 4-port X710 QAD4 NICs

Fujinaka, Todd todd.fujinaka at intel.com
Mon Aug 12 21:47:56 UTC 2019


Oh, and someone gave me the standard "check the bios settings" answer too, and enable memory over 8GB. Probably more of a desktop setting than a server setting, but I don't know what system you're running.

Todd Fujinaka
Software Application Engineer
Datacenter Engineering Group
Intel Corporation
todd.fujinaka at intel.com


-----Original Message-----
From: Intel-wired-lan [mailto:intel-wired-lan-bounces at osuosl.org] On Behalf Of Fujinaka, Todd
Sent: Monday, August 12, 2019 2:38 PM
To: Ben Greear <greearb at candelatech.com>; intel-wired-lan <intel-wired-lan at lists.osuosl.org>
Subject: Re: [Intel-wired-lan] CMA alloc failed with 6 4-port X710 QAD4 NICs

We probably need a lot of continguous memory. Offhand, I don't know, but with >1500 queue pairs, we need a lot of memory in general.

I don't think we've had any more than 8 NICs in a system, and when I asked some people how many NICs we can use they gave me a more practical answer: 1 less than the config that makes the system unusable.

I don' t think there is a catch-all answer, so the questions we'd have are:
1) how much memory do you have
2) how many cards do you have in the system
3) how many option roms are in the cards in the system
4) you're not running a 32-bit OS, are you?

Todd Fujinaka
Software Application Engineer
Datacenter Engineering Group
Intel Corporation
todd.fujinaka at intel.com

-----Original Message-----
From: Intel-wired-lan [mailto:intel-wired-lan-bounces at osuosl.org] On Behalf Of Ben Greear
Sent: Monday, August 12, 2019 2:15 PM
To: intel-wired-lan <intel-wired-lan at lists.osuosl.org>
Subject: [Intel-wired-lan] CMA alloc failed with 6 4-port X710 QAD4 NICs

Hello,

I have a user trying to boot up our 4.20+ kernel with 6 4-port 10G NICs in it.

dmesg is full of cma_alloc errors.  I increased CMA space to 32MB, but still no luck.

Any idea how much CMA memory is needed for this config?

Thanks,
Ben

-- 
Ben Greear <greearb at candelatech.com>
Candela Technologies Inc  http://www.candelatech.com

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