On Tue, 2 Oct 2012, Dave Chinner wrote:
On Tue, Oct 02, 2012 at 05:25:53AM +0200, Fredrik Tolf wrote:
On Tue, 2 Oct 2012, Dave Chinner wrote:
On Tue, Oct 02, 2012 at 03:53:08AM +0200, Fredrik Tolf wrote:
What is a "simple IO operation"?
Sorry, what I meant by "simple" is mostly on the interface level.
Like, a single syscall (with far less than a page of data in the
case of read or write), or, in this case, reading a single mmap'ed
page.
Which might be "simple" by themselves, but when an application is
doing thousands of such operations a second, the result is far from
simple....
Certainly; though I seem to be bad at communicating it, the point I was
trying to make is that it is, from the point of view of userspace,
individual calls that take extremely long, rather than total throughput
being poor. :)
--
Fredrik Tolf
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