[Bug 43484] Re: poor disk performance during heavy io

[J. Bruce Fields]

This is indeed very annoying.  I typically see it when trying to edit
files while doing a big kernel compile.  For a hypothesis, (probably
easy to confirm by strace'ing vim), see the email thread appended to
this article:

http://kerneltrap.org/node/14148

"it turns out that it's due to vim doing an occasional fsync not only
on writeout, but during normal use too. "set nofsync" in the .vimrc
solves this problem."

But I haven't tested that.  It sounds like it might also help to mount
with data=writeback (but see "man mount" for consistency warning),  or
to switch to a filesystem other than ext3.

-- 
poor disk performance during heavy io
https://bugs.launchpad.net/bugs/43484
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