Messages in this thread | | | Date | Fri, 29 Jul 2011 11:12:02 -0700 | From | Badari Pulavarty <> | Subject | Re: [RFC PATCH]vhost-blk: In-kernel accelerator for virtio block device |
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Hi Liu Yuan,
I am glad to see that you started looking at vhost-blk. I did an attempt year ago to improve block performance using vhost-blk approach.
http://lwn.net/Articles/379864/ http://lwn.net/Articles/382543/
I will take a closer look at your patchset to find differences and similarities.
- I focused on using vfs interfaces in the kernel, so that I can use it for file-backed devices. Our use-case scenario is mostly file-backed images.
- In few cases, virtio-blk did outperform vhost-blk -- which was counter intuitive - but couldn't exactly nail down. why ?
- I had to implement my own threads for parellism. I see that you are using aio infrastructure to get around it.
- In our high scale performance testing, what we found is block-backed device performance is pretty close to bare-metal (91% of bare-metal). vhost-blk didn't add any major benefits to it. I am curious on your performance analysis & data on where you see the gains and why ?
Hence I prioritized my work low :(
Now that you are interested in driving this, I am happy to work with you and see what vhost-blk brings to the tables. (even if helps us improve virtio-blk).
Thanks, Badari
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