Date: Tue, 4 Jan 2011 00:11:01 +0900 From: Takeshi HASEGAWA <hasegaw@gmail.com> To: freebsd-current@freebsd.org Cc: wakatono@todo.gr.jp, soda@netbsd.org, rusty@au.ibm.com, Takeshi HASEGAWA <hasegaw@gmail.com>, ito@virtualtech.jp, aliguori@us.ibm.com Subject: Another virtio drivers for FreeBSD Message-ID: <AANLkTi=7gB7wrWLd7zSn31GY7f61vt5TbHkcOchVOJGv@mail.gmail.com>
next in thread | raw e-mail | index | archive | help
Hi freebsd-current, I noticed there are some threads about virtio drivers for FreeBSD and NetBSD on this mailing list, so I would like to post my virtio drivers. I've worked on these drivers for a few months to understand para-virtalized drivers. I sent early versions to Rusty Russel, the author of virtio, since I attended to Rusty's virtio session at LinuxCon 2010 Tokyo and decided to work on it. My virtio-net & virtio-blk driver is not complete just now, but it looks working fine. I confirmed these drivers working with FreeBSD 8.1-R on Fedora 14 KVM. Both driver can deliver better performance than h/w emulation. http://ysr.jp/~hasegaw/virtio-20110103-2316.tar.gz I'm sorry for very nasty code; I am newbie in both of C and kernel-space code. ;) Now I am suffering with performance problem with virtio-blk driver. I've heard some people said FreeBSD's disk I/O on KVM is very poor so I have implemented block I/O, but the paravirtual driver's performance is still very bad - "almost same" with SCSI emulation, expecting CPU stress. http://ysr.jp/~hasegaw/20101203virtio-blk5.txt Now I am doubting FreeBSD and qemu-kvm's storage layer may not be compatible so well. Anyone is examining about this? I especially thank to Noriyuki Soda <soda at netbsd dot org> because he gave me a lot of advices when I was suffering with usage of bus_dma framework and some other issues. For NetBSD, it looks Makoto Minoura <minoura at netbsd dot org> has already ported virtio drivers. (I'm not sure these are already commited to main tree or not) http://www.minoura.org/~minoura/virtio-100605/ -- Takeshi HASEGAWA <hasegaw@gmail.com>
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?AANLkTi=7gB7wrWLd7zSn31GY7f61vt5TbHkcOchVOJGv>