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Message-ID: <CAMrG31z_Y9tdxGXOjEah_hBfeKWjakJWJ4=k8T7t4mbq-pJxNA@mail.gmail.com> Date: Fri, 24 Jan 2014 15:40:48 -0300 From: Alejandro Comisario <alejandro.comisario@...cadolibre.com> To: Jason Wang <jasowang@...hat.com> Cc: Stefan Hajnoczi <stefanha@...il.com>, 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) Well, its confirmed that ... because of the shape of our traffic, constant burst of many many small packages (1.5k / 3.5k) Nagle algorithm was in a beggining the root cause of our performance issues. So i will have this thread as solved. Thank you so much to everyone involved, specially people from RedHat. Thanks a lot! 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 Thu, Jan 23, 2014 at 4:25 PM, Alejandro Comisario <alejandro.comisario@...cadolibre.com> wrote: > Jason, Stefan ... thank you so much. > At a glance, disabling Nagle algorithm made the hundred thousands > "20ms" delays to dissapear suddenly, tomorrow we are gonna made a > "whole day" test again, and test client connectivity against "NginX > and Memcached" to see if, because of the traffic we have (hundred > thousands packages per minute) Nagle introduced this delay. > > I'll get back to you tomorrow with the tests. > Thanks again. > > kindest 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 Thu, Jan 23, 2014 at 12:14 AM, Jason Wang <jasowang@...hat.com> wrote: >> 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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