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Message-ID: <52E08915.9070007@redhat.com> Date: Thu, 23 Jan 2014 11:14:29 +0800 From: Jason Wang <jasowang@...hat.com> To: Alejandro Comisario <alejandro.comisario@...cadolibre.com>, Stefan Hajnoczi <stefanha@...il.com> CC: kvm@...r.kernel.org, linux-kernel@...r.kernel.org, "Michael S. Tsirkin" <mst@...hat.com> Subject: Re: kvm virtio ethernet ring on guest side over high throughput (packet per second) On 01/23/2014 05:32 AM, Alejandro Comisario wrote: > Thank you so much Stefan for the help and cc'ing Michael & Jason. > Like you advised yesterday on IRC, today we are making some tests with > the application setting TCP_NODELAY in the socket options. > > So we will try that and get back to you with further information. > In the mean time, maybe showing what options the vms are using while running ! > > # ------------------------------------------------------------------------------------------------------------------------------------------------------------------ > /usr/bin/kvm -S -M pc-1.0 -cpu > core2duo,+lahf_lm,+rdtscp,+pdpe1gb,+aes,+popcnt,+x2apic,+sse4.2,+sse4.1,+dca,+xtpr,+cx16,+tm2,+est,+vmx,+ds_cpl,+pbe,+tm,+ht,+ss,+acpi,+ds > -enable-kvm -m 32768 -smp 8,sockets=1,cores=6,threads=2 -name > instance-00000254 -uuid d25b1b20-409e-4d7f-bd92-2ef4073c7c2b > -nodefconfig -nodefaults -chardev > socket,id=charmonitor,path=/var/lib/libvirt/qemu/instance-00000254.monitor,server,nowait > -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc > -no-shutdown -kernel /var/lib/nova/instances/instance-00000254/kernel > -initrd /var/lib/nova/instances/instance-00000254/ramdisk -append > root=/dev/vda console=ttyS0 -drive > file=/var/lib/nova/instances/instance-00000254/disk,if=none,id=drive-virtio-disk0,format=qcow2,cache=writethrough > -device virtio-blk-pci,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0 > -netdev tap,fd=19,id=hostnet0 -device Better enable vhost as Stefan suggested. It may help a lot here. > virtio-net-pci,netdev=hostnet0,id=net0,mac=fa:16:3e:27:d4:6d,bus=pci.0,addr=0x3 > -chardev file,id=charserial0,path=/var/lib/nova/instances/instance-00000254/console.log > -device isa-serial,chardev=charserial0,id=serial0 -chardev > pty,id=charserial1 -device isa-serial,chardev=charserial1,id=serial1 > -usb -device usb-tablet,id=input0 -vnc 0.0.0.0:4 -k en-us -vga cirrus > -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5 > # ------------------------------------------------------------------------------------------------------------------------------------------------------------------ > > best regards > > > Alejandro Comisario > #melicloud CloudBuilders > Arias 3751, Piso 7 (C1430CRG) > Ciudad de Buenos Aires - Argentina > Cel: +549(11) 15-3770-1857 > Tel : +54(11) 4640-8443 > > > On Wed, Jan 22, 2014 at 12:22 PM, Stefan Hajnoczi <stefanha@...il.com> wrote: >> On Tue, Jan 21, 2014 at 04:06:05PM -0200, Alejandro Comisario wrote: >> >> CCed Michael Tsirkin and Jason Wang who work on KVM networking. >> >>> Hi guys, we had in the past when using physical servers, several >>> throughput issues regarding the throughput of our APIS, in our case we >>> measure this with packets per seconds, since we dont have that much >>> bandwidth (Mb/s) since our apis respond lots of packets very small >>> ones (maximum response of 3.5k and avg response of 1.5k), when we >>> where using this physical servers, when we reach throughput capacity >>> (due to clients tiemouts) we touched the ethernet ring configuration >>> and we made the problem dissapear. >>> >>> Today with kvm and over 10k virtual instances, when we want to >>> increase the throughput of KVM instances, we bumped with the fact that >>> when using virtio on guests, we have a max configuration of the ring >>> of 256 TX/RX, and from the host side the atached vnet has a txqueuelen >>> of 500. >>> >>> What i want to know is, how can i tune the guest to support more >>> packets per seccond if i know that's my bottleneck? >> I suggest investigating performance in a systematic way. Set up a >> benchmark that saturates the network. Post the details of the benchmark >> and the results that you are seeing. >> >> Then, we can discuss how to investigate the root cause of the bottleneck. >> >>> * does virtio exposes more packets to configure in the virtual ethernet's ring ? >> No, ring size is hardcoded in QEMU (on the host). >> >>> * does the use of vhost_net helps me with increasing packets per >>> second and not only bandwidth? >> vhost_net is generally the most performant network option. >> >>> does anyone has to struggle with this before and knows where i can look into ? >>> there's LOOOOOOOOOOOOOOOTS of information about networking performance >>> tuning of kvm, but nothing related to increase throughput in pps >>> capacity. >>> >>> This is a couple of configurations that we are having right now on the >>> compute nodes: >>> >>> * 2x1Gb bonded interfaces (want to know the more than 20 models we are >>> using, just ask for it) >>> * Multi queue interfaces, pined via irq to different cores >>> * Linux bridges, no VLAN, no open-vswitch >>> * ubuntu 12.04 kernel 3.2.0-[40-48] > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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