Sluggish scheduling during a long disk copy
kris at FreeBSD.org
Sun Nov 9 14:11:47 PST 2008
> Kris Kennaway(kris at FreeBSD.org)@2008.11.09 12:57:16 -0800:
>>> could be an issue with ntfs-3g driver
>> Sounds like it to me. ntfs-3g uses FUSE, which is a userland filesystem
>> framework. By design it will have poor I/O performance since every I/O
>> transfer will require multiple trips into and out of the kernel.
> The FS performance isn't the issue, the poor interactive performance is.
If you're thrashing your system with too many context switches or I/O
load it is expected that performance will suffer. You should do some
additional investigation with the standard monitoring tools (top,
vmstat, gstat, etc) to determine what your system is doing.
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