That's showing you have 0 hugepages free. Maybe they weren't passed through to the VM properly?
On Tue, Mar 1, 2022 at 7:50 PM Lombardo, Ed <ed.lomba...@netscout.com> wrote: > [root@vSTREAM_632 ~]# cat /proc/meminfo > > MemTotal: 32778372 kB > > MemFree: 15724124 kB > > MemAvailable: 15897392 kB > > Buffers: 18384 kB > > Cached: 526768 kB > > SwapCached: 0 kB > > Active: 355140 kB > > Inactive: 173360 kB > > Active(anon): 62472 kB > > Inactive(anon): 12484 kB > > Active(file): 292668 kB > > Inactive(file): 160876 kB > > Unevictable: 13998696 kB > > Mlocked: 13998696 kB > > SwapTotal: 3906556 kB > > SwapFree: 3906556 kB > > Dirty: 76 kB > > Writeback: 0 kB > > AnonPages: 13986156 kB > > Mapped: 95500 kB > > Shmem: 16864 kB > > Slab: 121952 kB > > SReclaimable: 71128 kB > > SUnreclaim: 50824 kB > > KernelStack: 4608 kB > > PageTables: 31524 kB > > NFS_Unstable: 0 kB > > Bounce: 0 kB > > WritebackTmp: 0 kB > > CommitLimit: 19247164 kB > > Committed_AS: 14170424 kB > > VmallocTotal: 34359738367 kB > > VmallocUsed: 212012 kB > > VmallocChunk: 34342301692 kB > > Percpu: 2816 kB > > HardwareCorrupted: 0 kB > > AnonHugePages: 13228032 kB > > CmaTotal: 0 kB > > CmaFree: 0 kB > > HugePages_Total: 1024 > > HugePages_Free: 0 > > HugePages_Rsvd: 0 > > HugePages_Surp: 0 > > Hugepagesize: 2048 kB > > DirectMap4k: 104320 kB > > DirectMap2M: 33449984 kB > > > > *From:* Cliff Burdick <shakl...@gmail.com> > *Sent:* Tuesday, March 1, 2022 10:45 PM > *To:* Lombardo, Ed <ed.lomba...@netscout.com> > *Cc:* Stephen Hemminger <step...@networkplumber.org>; users@dpdk.org > *Subject:* Re: How to increase mbuf size in dpdk version 17.11 > > > > *External Email:* This message originated outside of NETSCOUT. Do not > click links or open attachments unless you recognize the sender and know > the content is safe. > > Can you paste the output of "cat /proc/meminfo"? > > > > On Tue, Mar 1, 2022 at 5:37 PM Lombardo, Ed <ed.lomba...@netscout.com> > wrote: > > Here is the output from rte_mempool_dump() after creating the mbuf " > mbuf_pool_create (mbuf_seg_size=16512, nb_mbuf=32768, socket_id=0)": > nb_mbuf_per_pool = 32768 > mb_size = 16640 > 16512 * 32768 = 541,065,216 > > mempool <mbuf_pool_socket_0>@0x17f811400 > flags=10 > pool=0x17f791180 > iova=0x80fe11400 > nb_mem_chunks=1 > size=32768 > populated_size=32768 > header_size=64 > elt_size=16640 > trailer_size=0 > total_obj_size=16704 > private_data_size=64 > avg bytes/object=16704.000000 > internal cache infos: > cache_size=250 > cache_count[0]=0 > ... > cache_count[126]=0 > cache_count[127]=0 > total_cache_count=0 > common_pool_count=32768 > no statistics available > > -----Original Message----- > From: Stephen Hemminger <step...@networkplumber.org> > Sent: Tuesday, March 1, 2022 5:46 PM > To: Cliff Burdick <shakl...@gmail.com> > Cc: Lombardo, Ed <ed.lomba...@netscout.com>; users@dpdk.org > Subject: Re: How to increase mbuf size in dpdk version 17.11 > > External Email: This message originated outside of NETSCOUT. Do not click > links or open attachments unless you recognize the sender and know the > content is safe. > > On Tue, 1 Mar 2022 13:37:07 -0800 > Cliff Burdick <shakl...@gmail.com> wrote: > > > Can you verify how many buffers you're allocating? I don't see how > > many you're allocating in this thread. > > > > On Tue, Mar 1, 2022 at 1:30 PM Lombardo, Ed <ed.lomba...@netscout.com> > > wrote: > > > > > Hi Stephen, > > > The VM is configured to have 32 GB of memory. > > > Will dpdk consume the 2GB of hugepage memory for the mbufs? > > > I don't mind having less mbufs with mbuf size of 16K vs original > > > mbuf size of 2K. > > > > > > Thanks, > > > Ed > > > > > > -----Original Message----- > > > From: Stephen Hemminger <step...@networkplumber.org> > > > Sent: Tuesday, March 1, 2022 2:57 PM > > > To: Lombardo, Ed <ed.lomba...@netscout.com> > > > Cc: users@dpdk.org > > > Subject: Re: How to increase mbuf size in dpdk version 17.11 > > > > > > External Email: This message originated outside of NETSCOUT. Do not > > > click links or open attachments unless you recognize the sender and > > > know the content is safe. > > > > > > On Tue, 1 Mar 2022 18:34:22 +0000 > > > "Lombardo, Ed" <ed.lomba...@netscout.com> wrote: > > > > > > > Hi, > > > > I have an application built with dpdk 17.11. > > > > During initialization I want to change the mbuf size from 2K to 16K. > > > > I want to receive packet sizes of 8K or more in one mbuf. > > > > > > > > The VM running the application is configured to have 2G hugepages. > > > > > > > > I tried many things and I get an error when a packet arrives. > > > > > > > > I read online that there is #define DEFAULT_MBUF_DATA_SIZE that I > > > changed from 2176 to ((2048*8)+128), where 128 is for headroom. > > > > The call to rte_pktmbuf_pool_create() returns success with my > changes. > > > > From the rte_mempool_dump() - "rx_nombuf" - Total number of Rx > > > > mbuf > > > allocation failures. This value increments each time a packet > arrives. > > > > > > > > Is there any reference document explaining what causes this error? > > > > Is there a user guide I should follow to make the mbuf size > > > > change, > > > starting with the hugepage value? > > > > > > > > Thanks, > > > > Ed > > > > > > Did you check that you have enough memory in the system for the > > > larger footprint? > > > Using 16K per mbuf is going to cause lots of memory to be consumed. > > A little maths you can fill in your own values. > > Assuming you want 16K of data. > > You need at a minimum [1] > num_rxq := total number of receive queues > num_rxd := number of receive descriptors per receive queue > num_txq := total number of transmit queues (assume all can be full) > num_txd := number of transmit descriptors > num_mbufs = num_rxq * num_rxd + num_txq * num_txd + num_cores * > burst_size > > Assuming you are using code copy/pasted from some example like l3fwd. > With 4 Rxq > > num_mbufs = 4 * 1024 + 4 * 1024 + 4 * 32 = 8320 > > Each mbuf element requires [2] > elt_size = sizeof(struct rte_mbuf) + HEADROOM + mbuf_size > = 128 + 128 + 16K = 16640 > > obj_size = rte_mempool_calc_obj_size(elt_size, 0, NULL) > = 16832 > > So total pool is > num_mbufs * obj_size = 8320 * 16832 = 140,042,240 ~ 139M > > > [1] Some devices line bnxt need multiple buffers per packet. > [2] Often applications want additional space per mbuf for meta-data. > > >
