[vfio-users] Poor networking performance in linux with sr-iov NICs
Ryan Flagler
ryan.flagler at gmail.com
Tue Aug 22 17:14:12 UTC 2017
FYI for anyone else who comes across this. I was able to resolve the issue
by adding "iommu=pt" to my grub cmdline.
On Tue, Aug 22, 2017 at 10:31 AM, Ryan Flagler <ryan.flagler at gmail.com>
wrote:
> I'm currently using a VF nic passed through to windows 10 with great
> success. When I attempt to do the same with with a Linux guest machine, I
> see a kernel warning in my dmesg output and the nic not only performs
> poorly but also seems to cycle up and down from time to time. Any ideas?
>
> The dmesg output.
>
> [ 102.828264] WARNING: CPU: 0 PID: 0 at /build/linux-5EyXrQ/linux-4.4.0/net/sched/sch_generic.c:306
> dev_watchdog+0x237/0x240()
> [ 102.828289] NETDEV WATCHDOG: ens3 (igbvf): transmit queue 0 timed out
> [ 102.828297] Modules linked in: ppdev kvm_intel kvm irqbypass joydev
> input_leds serio_raw i2c_piix4 parport_pc parport 8250_fintek mac_hid
> ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp
> libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456
> async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq
> libcrc32c raid1 raid0 multipath linear hid_generic usbhid hid
> crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64
> lrw gf128mul glue_helper ablk_helper cryptd psmouse igbvf pata_acpi floppy
> [ 102.828342] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.4.0-87-generic
> #110-Ubuntu
> [ 102.828349] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
> 0.0.0 02/06/2015
> [ 102.828351] 0000000000000286 7717ad27f8874148 ffff88013fc03d98
> ffffffff813f9903
> [ 102.828354] ffff88013fc03de0 ffffffff81d70f18 ffff88013fc03dd0
> ffffffff81081332
> [ 102.828356] 0000000000000000 ffff8801384b0480 0000000000000000
> ffff88003527a000
> [ 102.828358] Call Trace:
> [ 102.828359] <IRQ> [<ffffffff813f9903>] dump_stack+0x63/0x90
> [ 102.828367] [<ffffffff81081332>] warn_slowpath_common+0x82/0xc0
> [ 102.828369] [<ffffffff810813cc>] warn_slowpath_fmt+0x5c/0x80
> [ 102.828372] [<ffffffff8175db97>] dev_watchdog+0x237/0x240
> [ 102.828375] [<ffffffff8175d960>] ? qdisc_rcu_free+0x40/0x40
> [ 102.828379] [<ffffffff810ecf25>] call_timer_fn+0x35/0x120
> [ 102.828381] [<ffffffff8175d960>] ? qdisc_rcu_free+0x40/0x40
> [ 102.828388] [<ffffffff810ed8da>] run_timer_softirq+0x23a/0x2f0
> [ 102.828390] [<ffffffff81085e11>] __do_softirq+0x101/0x290
> [ 102.828393] [<ffffffff81086113>] irq_exit+0xa3/0xb0
> [ 102.828396] [<ffffffff81844962>] smp_apic_timer_interrupt+0x42/0x50
> [ 102.828400] [<ffffffff81842c22>] apic_timer_interrupt+0x82/0x90
> [ 102.828401] <EOI> [<ffffffff81064636>] ? native_safe_halt+0x6/0x10
> [ 102.828407] [<ffffffff81038e5e>] default_idle+0x1e/0xe0
> [ 102.828409] [<ffffffff8103966f>] arch_cpu_idle+0xf/0x20
> [ 102.828413] [<ffffffff810c468a>] default_idle_call+0x2a/0x40
> [ 102.828415] [<ffffffff810c49f1>] cpu_startup_entry+0x2f1/0x350
> [ 102.828418] [<ffffffff8183570c>] rest_init+0x7c/0x80
> [ 102.828422] [<ffffffff81f5e011>] start_kernel+0x481/0x4a2
> [ 102.828425] [<ffffffff81f5d120>] ? early_idt_handler_array+0x120/0x120
> [ 102.828427] [<ffffffff81f5d339>] x86_64_start_reservations+0x2a/0x2c
> [ 102.828429] [<ffffffff81f5d485>] x86_64_start_kernel+0x14a/0x16d
> [ 102.828434] ---[ end trace 3dd091553181e0bf ]---
>
> Thanks!
>
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