On Wed, Apr 24, 2013 at 11:05:40AM -0400, J. Bruce Fields wrote: > On Wed, Apr 24, 2013 at 12:35:03PM +0000, Yan Burman wrote: > > > > > > > -----Original Message----- > > > From: J. Bruce Fields [mailto:bfields@xxxxxxxxxxxx] > > > Sent: Wednesday, April 24, 2013 00:06 > > > To: Yan Burman > > > Cc: Wendy Cheng; Atchley, Scott; Tom Tucker; linux-rdma@xxxxxxxxxxxxxxx; > > > linux-nfs@xxxxxxxxxxxxxxx; Or Gerlitz > > > Subject: Re: NFS over RDMA benchmark > > > > > > On Thu, Apr 18, 2013 at 12:47:09PM +0000, Yan Burman wrote: > > > > > > > > > > > > > -----Original Message----- > > > > > From: Wendy Cheng [mailto:s.wendy.cheng@xxxxxxxxx] > > > > > Sent: Wednesday, April 17, 2013 21:06 > > > > > To: Atchley, Scott > > > > > Cc: Yan Burman; J. Bruce Fields; Tom Tucker; > > > > > linux-rdma@xxxxxxxxxxxxxxx; linux-nfs@xxxxxxxxxxxxxxx > > > > > Subject: Re: NFS over RDMA benchmark > > > > > > > > > > On Wed, Apr 17, 2013 at 10:32 AM, Atchley, Scott > > > > > <atchleyes@xxxxxxxx> > > > > > wrote: > > > > > > On Apr 17, 2013, at 1:15 PM, Wendy Cheng <s.wendy.cheng@xxxxxxxxx> > > > > > wrote: > > > > > > > > > > > >> On Wed, Apr 17, 2013 at 7:36 AM, Yan Burman <yanb@xxxxxxxxxxxx> > > > > > wrote: > > > > > >>> Hi. > > > > > >>> > > > > > >>> I've been trying to do some benchmarks for NFS over RDMA and I > > > > > >>> seem to > > > > > only get about half of the bandwidth that the HW can give me. > > > > > >>> My setup consists of 2 servers each with 16 cores, 32Gb of > > > > > >>> memory, and > > > > > Mellanox ConnectX3 QDR card over PCI-e gen3. > > > > > >>> These servers are connected to a QDR IB switch. The backing > > > > > >>> storage on > > > > > the server is tmpfs mounted with noatime. > > > > > >>> I am running kernel 3.5.7. > > > > > >>> > > > > > >>> When running ib_send_bw, I get 4.3-4.5 GB/sec for block sizes 4-512K. > > > > > >>> When I run fio over rdma mounted nfs, I get 260-2200MB/sec for > > > > > >>> the > > > > > same block sizes (4-512K). running over IPoIB-CM, I get 200-980MB/sec. > > > > > > > > > > > > Yan, > > > > > > > > > > > > Are you trying to optimize single client performance or server > > > > > > performance > > > > > with multiple clients? > > > > > > > > > > > > > > I am trying to get maximum performance from a single server - I used 2 > > > processes in fio test - more than 2 did not show any performance boost. > > > > I tried running fio from 2 different PCs on 2 different files, but the sum of > > > the two is more or less the same as running from single client PC. > > > > > > > > What I did see is that server is sweating a lot more than the clients and > > > more than that, it has 1 core (CPU5) in 100% softirq tasklet: > > > > cat /proc/softirqs > > > > > > Would any profiling help figure out which code it's spending time in? > > > (E.g. something simple as "perf top" might have useful output.) > > > > > > > > > Perf top for the CPU with high tasklet count gives: > > > > samples pcnt RIP function DSO > > _______ _____ ________________ ___________________________ ___________________________________________________________________ > > > > 2787.00 24.1% ffffffff81062a00 mutex_spin_on_owner /root/vmlinux > > I guess that means lots of contention on some mutex? If only we knew > which one.... perf should also be able to collect stack statistics, I > forget how. Googling around.... I think we want: perf record -a --call-graph (give it a chance to collect some samples, then ^C) perf report --call-graph --stdio --b. > > --b. > > > 978.00 8.4% ffffffff810297f0 clflush_cache_range /root/vmlinux > > 445.00 3.8% ffffffff812ea440 __domain_mapping /root/vmlinux > > 441.00 3.8% 0000000000018c30 svc_recv /lib/modules/3.5.7-dbg/kernel/net/sunrpc/sunrpc.ko > > 344.00 3.0% ffffffff813a1bc0 _raw_spin_lock_bh /root/vmlinux > > 333.00 2.9% ffffffff813a19e0 _raw_spin_lock_irqsave /root/vmlinux > > 288.00 2.5% ffffffff813a07d0 __schedule /root/vmlinux > > 249.00 2.1% ffffffff811a87e0 rb_prev /root/vmlinux > > 242.00 2.1% ffffffff813a19b0 _raw_spin_lock /root/vmlinux > > 184.00 1.6% 0000000000002e90 svc_rdma_sendto /lib/modules/3.5.7-dbg/kernel/net/sunrpc/xprtrdma/svcrdma.ko > > 177.00 1.5% ffffffff810ac820 get_page_from_freelist /root/vmlinux > > 174.00 1.5% ffffffff812e6da0 alloc_iova /root/vmlinux > > 165.00 1.4% ffffffff810b1390 put_page /root/vmlinux > > 148.00 1.3% 0000000000014760 sunrpc_cache_lookup /lib/modules/3.5.7-dbg/kernel/net/sunrpc/sunrpc.ko > > 128.00 1.1% 0000000000017f20 svc_xprt_enqueue /lib/modules/3.5.7-dbg/kernel/net/sunrpc/sunrpc.ko > > 126.00 1.1% ffffffff8139f820 __mutex_lock_slowpath /root/vmlinux > > 108.00 0.9% ffffffff811a81d0 rb_insert_color /root/vmlinux > > 107.00 0.9% 0000000000004690 svc_rdma_recvfrom /lib/modules/3.5.7-dbg/kernel/net/sunrpc/xprtrdma/svcrdma.ko > > 102.00 0.9% 0000000000002640 send_reply /lib/modules/3.5.7-dbg/kernel/net/sunrpc/xprtrdma/svcrdma.ko > > 99.00 0.9% ffffffff810e6490 kmem_cache_alloc /root/vmlinux > > 96.00 0.8% ffffffff810e5840 __slab_alloc /root/vmlinux > > 91.00 0.8% 0000000000006d30 mlx4_ib_post_send /lib/modules/3.5.7-dbg/kernel/drivers/infiniband/hw/mlx4/mlx4_ib.ko > > 88.00 0.8% 0000000000000dd0 svc_rdma_get_context /lib/modules/3.5.7-dbg/kernel/net/sunrpc/xprtrdma/svcrdma.ko > > 86.00 0.7% ffffffff813a1a10 _raw_spin_lock_irq /root/vmlinux > > 86.00 0.7% 0000000000001530 svc_rdma_send /lib/modules/3.5.7-dbg/kernel/net/sunrpc/xprtrdma/svcrdma.ko > > 85.00 0.7% ffffffff81060a80 prepare_creds /root/vmlinux > > 83.00 0.7% ffffffff810a5790 find_get_pages_contig /root/vmlinux > > 79.00 0.7% ffffffff810e4620 __slab_free /root/vmlinux > > 79.00 0.7% ffffffff813a1a40 _raw_spin_unlock_irqrestore /root/vmlinux > > 77.00 0.7% ffffffff81065610 finish_task_switch /root/vmlinux > > 76.00 0.7% ffffffff812e9270 pfn_to_dma_pte /root/vmlinux > > 75.00 0.6% ffffffff810976d0 __call_rcu /root/vmlinux > > 73.00 0.6% ffffffff811a2fa0 _atomic_dec_and_lock /root/vmlinux > > 73.00 0.6% 00000000000002e0 svc_rdma_has_wspace /lib/modules/3.5.7-dbg/kernel/net/sunrpc/xprtrdma/svcrdma.ko > > 67.00 0.6% ffffffff813a1a70 _raw_read_lock /root/vmlinux > > 65.00 0.6% 000000000000f590 svcauth_unix_set_client /lib/modules/3.5.7-dbg/kernel/net/sunrpc/sunrpc.ko > > 63.00 0.5% 00000000000180e0 svc_reserve /lib/modules/3.5.7-dbg/kernel/net/sunrpc/sunrpc.ko > > 60.00 0.5% 00000000000064d0 stamp_send_wqe /lib/modules/3.5.7-dbg/kernel/drivers/infiniband/hw/mlx4/mlx4_ib.ko > > 57.00 0.5% ffffffff810ac110 free_hot_cold_page /root/vmlinux > > 57.00 0.5% ffffffff811ae540 memcpy /root/vmlinux > > 56.00 0.5% ffffffff810ad1a0 __alloc_pages_nodemask /root/vmlinux > > 55.00 0.5% ffffffff81118200 splice_to_pipe /root/vmlinux > > 53.00 0.5% ffffffff810e3bc0 get_partial_node /root/vmlinux > > 49.00 0.4% ffffffff812eb840 __intel_map_single /root/vmlinux > > > > > > > --b. > > > > > > > CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 CPU6 > > > CPU7 CPU8 CPU9 CPU10 CPU11 CPU12 CPU13 CPU14 > > > CPU15 > > > > HI: 0 0 0 0 0 0 0 0 0 > > > 0 0 0 0 0 0 0 > > > > TIMER: 418767 46596 43515 44547 50099 34815 > > > 40634 40337 39551 93442 73733 42631 42509 41592 > > > 40351 61793 > > > > NET_TX: 28719 309 1421 1294 1730 1243 832 > > > 937 11 44 41 20 26 19 15 29 > > > > NET_RX: 612070 19 22 21 6 235 3 2 > > > 9 6 17 16 20 13 16 10 > > > > BLOCK: 5941 0 0 0 0 0 0 0 > > > 519 259 1238 272 253 174 215 2618 > > > > BLOCK_IOPOLL: 0 0 0 0 0 0 0 0 > > > 0 0 0 0 0 0 0 0 > > > > TASKLET: 28 1 1 1 1 1540653 1 1 > > > 29 1 1 1 1 1 1 2 > > > > SCHED: 364965 26547 16807 18403 22919 8678 > > > 14358 14091 16981 64903 47141 18517 19179 18036 > > > 17037 38261 > > > > HRTIMER: 13 0 1 1 0 0 0 0 > > > 0 0 0 0 1 1 0 1 > > > > RCU: 945823 841546 715281 892762 823564 42663 > > > 863063 841622 333577 389013 393501 239103 221524 258159 > > > 313426 234030 -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
