Re: virtio-blk performance and MSI

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Christoph Hellwig <hch <at> lst.de> writes:

> Michael suggested to me a while ago to try MSI with virtio-blk and I
> played with this small patch:
> which gave about 5% speedups on 4k sized reads and writes, see the full
> iozone output I attached.  
> 
> 	File size set to 131072 KB
> 	Record Size 4 KB
> 	O_DIRECT feature enabled
> 	Command line used: iozone -s 128m -r 4k -I -f /dev/sdb
Is /dev/sdb a local disk? other?
What was the qemu command line parameters? specifically, what cache settings
were used when opening /dev/sdb
(Am actually interested in the differences between native and qemu)

Thanks very much,
Eran

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