Bob Friesenhahn wrote:
On Wed, 24 Jun 2009, Marcelo Leal wrote:
I think that is the purpose of the current implementation:
http://blogs.sun.com/roch/entry/the_new_zfs_write_throttle But seems
like is not that easy... as i did understand what Roch said, seems
like the cause is not always a "hardy" writer.
I see this:
"The new code keeps track of the amount of data accepted in a TXG and
the time it takes to sync. It dynamically adjusts that amount so that
each TXG sync takes about 5 seconds (txg_time variable). It also
clamps the limit to no more than 1/8th of physical memory."
hmmm... methinks there is a chance that the 1/8th rule might not work so
well
for machines with lots of RAM and slow I/O. I'm also reasonably sure that
that sort of machine is not what Sun would typically build for
performance lab
testing, as a rule. Hopefully Roch will comment when it is morning in
Europe.
-- richard
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