Stefan Hajnoczi stefa...@gmail.com wrote on 09/04/2013 06:13:47 PM:
From: Stefan Hajnoczi stefa...@gmail.com
To: Juan Quintela quint...@redhat.com,
Cc: qemu-devel qemu-devel qemu-de...@nongnu.org, KVM devel mailing
list kvm@vger.kernel.org
Date: 09/04/2013 06:13 PM
Subject: Re: [Qemu-devel] KVM call agenda for 2013-04-09
Sent by: qemu-devel-bounces+abelg=il.ibm@nongnu.org
Meeting notes on Abel's presentation:
Aim: improve vhost scalability
Shared vhost thread
==
Problem: Linux scheduler does not see state of virtqueues, cannot make
good scheduling decisions
Solution: Shared thread serves multiple VMs and therefore influences
I/O scheduling instead of kernel thread per vhost device
Exitless communication
=
* Polling on host to notice guest vring updates without guest pio
instruction
* Use CPU affinity to bind vcpus to separate cores and let polling
run on dedicated cores
* Existless Interrupt (ELI) or future hardware APIC virtualization
feature to inject virtual interrupts
without vmexit and EOI
See paper for performance results (impressive numbers):
http://domino.research.ibm.com/library/cyberdig.nsf/papers/
479E3578ED05BFAC85257B4200427735/$File/h-0319.pdf
Abel will publish rebased code on GitHub but does not have time to
upstream them.
The next step: QEMU/KVM community can digest the paper + patches and
decide on ideas to upstream.
It has been a while since this KVM call but the code for ELVIS and
ELI is now available in github:
https://github.com/abelg/virtual_io_acceleration/commits/ibm-io-acceleration-3.9-github
Source-code contributors (in alphabetical order):
Nadav Amit nadav.a...@gmail.com
Muli Ben-Yehuda mu...@mulix.org
Abel Gordon ab...@il.ibm.com
Nadav Har'El n...@math.technion.ac.il
Alex Landau landau.a...@gmail.com
Each commit made in September 16th represents a separate and documented
patch. Note this work is under development and more effort is required to
make
it upstream-ready. You are all welcome to join the upstreaming effort :)
A short documentation can be found in the wiki page:
https://github.com/abelg/virtual_io_acceleration/wiki/Virtual-I-O-acceleration-technologies-for-KVM
Please note this work will be presented and discussed in the upcoming KVM
forum
(October 21-23, Edinburgh, UK)
Regards,
Abel.
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