Peter Schuller writes:
> > I agree about the usefulness of fbarrier() vs. fsync(), BTW. The cool
> > thing is that on ZFS, fbarrier() is a no-op. It's implicit after
> > every system call.
>
> That is interesting. Could this account for disproportionate kernel
> CPU usage for applications that perform I/O one byte at a time, as
> compared to other filesystems? (Nevermind that the application
> shouldn't do that to begin with.)
I just quickly measured this (overwritting files in CHUNKS);
This is a software benchmark (I/O is non-factor)
CHUNK ZFS vz UFS
1B 4X slower
1K 2X slower
8K 25% slower
32K equal
64K 30% faster
Quick and dirty but I think it paints a picture.
I can't really answer your question though.
-r
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