[pve-devel] diskstats : wchar vs write_bytes

[Dietmar Maurer]

> I was checking rrd io stats for a vm I was installing, and something strange.
> 
> I have a lot of writes, but
> wchar < rchar
> but
> write_bytes > read_bytes
> 
> 
> write_bytes,read_bytes seem to be the correct values, reported in qemu
> monitor also
> I also check on my storage,write_bytes is the correct value.
> 
> what's the difference between wchar and write_bytes ?

Cache? Details are available here:

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=blob;f=Documentation/filesystems/proc.txt;h=b7413cb46dcb1f1a331068861e766a6c03a5da40;hb=HEAD#l1387

- Dietmar