Wednesday, 2020-05-27

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kata-irc-bot<simon.kaegi> My team has been using the "qemu" runtime with 9p in production for the last six months. With 1.11 we've been experimenting with "qemu-virtio" and it's about twice as fast for our use-case which is great. The problem for us is that it's using the virtio-fs-dev experimental kernel and because of our compliance posture we need to do frequent kernel update and rebuilds. This is really hard to do with the experimental kernel as naturally14:26
kata-irc-botthe focus is cool new virtio-fs features vs rebasing on the latest kernel version.14:26
kata-irc-bot<simon.kaegi> I read that even for the "qemu" runtime kata might switch over to virtio-fs. Is that something I could get involved in and help with? How hard would it be to rebuild the qemu runtime stack to package a virtiosfd and have it work?14:29
kata-irc-bot<fidencio> @simon.kaegi, heya!14:31
kata-irc-bot<fidencio> are you using custom kernel / qemu? Or from which distro are you running kata from?14:31
kata-irc-bot<fidencio> Asking as qemu + virtio-fs is already there for kata, if using new enough qemu / kernel.14:32
kata-irc-bot<fidencio> it landed on qemu on 5.0.0 (IIRC), and on kernel on 5.414:32
kata-irc-bot<simon.kaegi> We work with the 1.11.0 release and basically patch that with new kernels and qemu14:32
kata-irc-bot<simon.kaegi> so we're currently using 5.4.42 and qemu 4.1.114:32
kata-irc-bot<fidencio> okay, kata 1.11.0 already has support for virtiofs, we're using that on Fedora (for instance)14:33
kata-irc-bot<fidencio> You'd need a newer version of qemu, tho, as mentioned above you'd need 5.0 at least14:33
kata-irc-bot<fidencio> and, kernel wise, you should be good to go14:33
kata-irc-bot<simon.kaegi> ok hmm...14:33
kata-irc-bot<fidencio> are you running based on some specific distro?14:34
kata-irc-bot<simon.kaegi> I noticed the virtiosfd in the release is coming from the experimental kernel -- can i rebuild that in someway14:34
kata-irc-bot<simon.kaegi> We use a variant on kata-deploy14:34
kata-irc-bot<fidencio> Aha! Okay. kata-deploy should have everything in place for virtiofs14:35
kata-irc-bot<fidencio> @julio.montes ^14:35
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kata-irc-bot<simon.kaegi> Ok thanks @fidencio I'll try to see what I can put together14:55
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