On Mon, May 14, 2018 at 11:25 PM, Christopher Cox <[email protected]> wrote:
> In the ideal case, what you'd have: > > |---- Single virtio virtual interface > | > VM ---- Host ==== Switch stack > | > |------- 4x 1Gbit interfaces bonded over LACP > > The change: virtio instead of "1 Gbit" > > You can't get blood from a stone, that is, you can't manufacture bandwidth > that isn't there. If you need more than gigabit speed, you need something > like 10Gbit. Realize that usually, we're talking about a system created to > run more than one VM. If just one, you'll do better with dedicated > hardware. If more than one VM, then there sharing going on, though you > might be able to use QoS (either in oVirt or outside). Even so, if just one > VM on 10Gbit, you won't necessarily get full 10Gbit out of virtio. But at > the same time bonding should help in the case of multiple VMs. > Jumbo frames may help in some workloads and give ~5% boost or so. Y. > > Now, back to the suggestion at hand. Multiple virtual NICs. If the > logical networks presented via oVirt are such that each (however many) > logical network has it's own "pipe", then defining a vNIC on each of those > networks gets you the same sort of "gain" with respect to bonding. That > is, no magic bandwidth increase for a particular connection, but more pipes > available for multiple connections (essentially what you'd expect). > > Obviously up to you how you want to do this. I think you might do better > to consider a better underlying infrastructure to oVirt rather than trying > to bond vNICs. Pretty sure I'm right about that. Would think the idea of > bonding at the VM level might be best for simulating something rather than > something you do because it's right/best. > > > > On 05/14/2018 03:03 PM, Doug Ingham wrote: > >> On 14 May 2018 at 15:35, Juan Pablo <[email protected] <mailto: >> [email protected]>> wrote: >> >> so you have lacp on your host, and you want lacp also on your vm... >> somehow doesn't sounds correct. >> there are several lacp modes. which one are you using on the host? >> >> >> Correct! >> >> |---- Single 1Gbit virtual interface >> | >> VM ---- Host ==== Switch stack >> | >> |------- 4x 1Gbit interfaces bonded over LACP >> >> The traffic for all of the VMs is distributed across the host's 4 bonded >> links, however each VM is limited to the 1Gbit of its own virtual >> interface. In the case of my proxy, all web traffic is routed through it, >> so its single Gbit interface has become a bottleneck. >> >> To increase the total bandwidth available to my VM, I presume I will need >> to add multiple Gbit VIFs & bridge them with a bonding mode. >> Balance-alb (mode 6) is one option, however I'd prefer to use LACP (mode >> 4) if possible. >> >> >> 2018-05-14 16:20 GMT-03:00 Doug Ingham: >> >> On 14 May 2018 at 15:03, Vinícius Ferrão wrote: >> >> You should use better hashing algorithms for LACP. >> >> Take a look at this explanation: >> https://www.ibm.com/developerworks/community/blogs/ >> storageneers/entry/Enhancing_IP_Network_Performance_with_LACP?lang=en >> <https://www.ibm.com/developerworks/community/blogs/ >> storageneers/entry/Enhancing_IP_Network_Performance_with_LACP?lang=en> >> >> In general only L2 hashing is made, you can achieve better >> throughput with L3 and multiple IPs, or with L4 (ports). >> >> Your switch should support those features too, if you’re >> using one. >> >> V. >> >> >> The problem isn't the LACP connection between the host & the >> switch, but setting up LACP between the VM & the host. For >> reasons of stability, my 4.1 cluster's switch type is currently >> "Linux Bridge", not "OVS". Ergo my question, is LACP on the VM >> possible with that, or will I have to use ALB? >> >> Regards, >> Doug >> >> >> >> On 14 May 2018, at 15:16, Doug Ingham wrote: >> >> Hi All, >> My hosts have all of their interfaces bonded via LACP to >> maximise throughput, however the VMs are still limited to >> Gbit virtual interfaces. Is there a way to configure my VMs >> to take full advantage of the bonded physical interfaces? >> >> One way might be adding several VIFs to each VM & using ALB >> bonding, however I'd rather use LACP if possible... >> >> Cheers, >> -- >> Doug >> >> >> -- Doug >> >> >> >> >> -- >> Doug >> >> >> _______________________________________________ >> Users mailing list -- [email protected] >> To unsubscribe send an email to [email protected] >> >> _______________________________________________ > Users mailing list -- [email protected] > To unsubscribe send an email to [email protected] > oVirt Code of Conduct: https://www.ovirt.org/communit > y/about/community-guidelines/ > List Archives: >
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