On 12/17/14 03:03, Ouyang, Changchun wrote: > Hi , > >> -----Original Message----- >> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Vlad Zolotarov >> Sent: Tuesday, December 16, 2014 11:36 PM >> To: Thomas Monjalon >> Cc: dev at dpdk.org; Avi Kivity; Gleb Natapov >> Subject: Re: [dpdk-dev] DPDK RSS support for ixgbevf PMD >> >> >> On 12/15/14 22:33, Thomas Monjalon wrote: >>> 2014-12-15 21:11, Vladislav Zolotarov: >>>> Hi, >>>> I'm running an ixgbevf PMD on an AWS guests with extended networking >>>> (SR-IOV functions of 82599 Intel's NIC) and noticed that even in the >>>> current git tree there is no support for a multi-queue in this PMD: >>>> reta size returned by rte_eth_dev_info_get() call is 0, while >>>> max_rx_queues and max_tx_queues are both 4. >>>> >>>> Linux ixgbevf-2.15.3 driver on the other hand successfully >>>> initializes 2 RSS queues: for some reason it always limits the number of >> RSS queues by 2. >>>> ixgbevf_main.c: line 2539 >>>> u16 rss = min_t(u16, num_online_cpus(), 2); >>>> >>>> The above is strange since if MRQE is set to 1010b there are 4 RSS >>>> queues available which seems to be the case in my AWS Guest. >>>> >>>> However, let's get back to DPDK. As I've mentioned above the SR-IOV >>>> function i have is RSS capable (to be 100% sure I've verified both >>>> queues are receiving packets in a multi-socket TCP test). And it's a >>>> shame I can't utilize it with a DPDK. >>> Yes, it is not yet supported. >>> But a patch was recently sent: >>> http://dpdk.org/ml/archives/dev/2014-December/010028.html >> Applying this patchset seems to break the NIC fast path functionality of a >> AWS Guest NIC. >> I'm still debugging it - will update u as soon as I have more specific info.
Hi, thanks for tips but I have a question below. > Pls make sure enabling and using 4 queues on guest Why should I enable all 4? Won't any number below or equal 4 work if (!) 4 queues are available? Note that there is a 82599 mode when only 2 RSS queues are available per VF: MRQE=1011b. > if you enable vf rss on host and if each vf has 4 queues, > The packet could be received and put in any of 4 queues on guest depend on > hash value of the packet. > You could let packet IP address increased continuously and make those packets > distribute to different queues. > > Thanks > Changchun
