7 Replies Latest reply on Sep 6, 2017 7:42 AM by wtao000

SR-IOV multiqueue support with ixgbe/ixgbevf drivers

anmarin Jul 31, 2015 3:10 AM

Hello,

I have Intel 82599 10Gb NIC which supports SR-IOV function. PF driver is v4.0.3, compiled with CFLAGS_EXTRA="-DIXGBE_ENABLE_VF_MQ" option. VF driver is v2.16.1 (both in host and guest machines). OS is SLES12 with 3.12.43 kernel. SR-IOV is fully set up, VFs are assigned to VMs and everything is working fine.

However, I've noticed that there are maximum of 4 TxRx queue pairs in host machine and only 2 TxRx queue pairs in VM guest machines, not matter which options are used while loading ixgbe driver. To me, this is a limiting factor when scaling VMs - assigning additional CPU cores does little if apps use a lot of network I/O and everything is handled by 2 cores...

Is this definitive limitation of ixgbe/ixgbevf drivers? Can number of queues be increased?

Br,

Ante

1. Re: SR-IOV multiqueue support with ixgbe/ixgbevf drivers

wb_Intel Aug 2, 2015 7:06 PM (in response to anmarin)

Hi Ante,

Thank you for the post. Let me check on this.

rgds,
wb
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2. Re: SR-IOV multiqueue support with ixgbe/ixgbevf drivers

wb_Intel Aug 26, 2015 5:35 PM (in response to anmarin)

Hi Anmarin,

Good day. Further checking, this Intel 82599 VF driver support maximum of two queues only.

Hope this clarifies.

rgds,
wb
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3. Re: SR-IOV multiqueue support with ixgbe/ixgbevf drivers

anmarin Aug 26, 2015 11:46 PM (in response to wb_Intel)

Hi,

thank you. Also confirmed by folks over at linux.nics.

Br,
Ante
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4. Re: SR-IOV multiqueue support with ixgbe/ixgbevf drivers

tbonds Oct 15, 2015 2:25 PM (in response to wb_Intel)

wb,

We are running 82599 10 Gigabit Dual Port NIC with the 4.1.2 Linux driver. Is it still the case that the driver only supports two queues pairs per VF? The driver documentation [1] seems to say the VFs will use pools with up to 8 queue pairs is this not correct? If not, are there plans to support more than 2 queue pairs per VF?

[1] Intel® 82599 SR-IOV Driver Companion Guide

Thanks,

-tom
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5. Re: SR-IOV multiqueue support with ixgbe/ixgbevf drivers

wb_Intel Oct 15, 2015 5:32 PM (in response to tbonds)

Hi tbonds,

Let me check for you if there will be any changes.

rgds,
wb
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6. Re: SR-IOV multiqueue support with ixgbe/ixgbevf drivers

wb_Intel Oct 20, 2015 7:36 PM (in response to tbonds)

Hi Tbonds,

Further checking, we do not have any plans to support more than two queues pairs per VF.

rgds
wb
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7. Re: SR-IOV multiqueue support with ixgbe/ixgbevf drivers

wtao000 Sep 6, 2017 7:42 AM (in response to anmarin)

so, the driver now still can support 2 queue at maximal?
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