Messages in this thread | | | Date | Wed, 11 Jan 2012 16:03:54 -0500 | From | "John Stoffel" <> | Subject | Re: [PATCH -mm] make swapin readahead skip over holes |
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>>>>> "Christoph" == Christoph Lameter <cl@linux.com> writes:
Christoph> On Wed, 11 Jan 2012, John Stoffel wrote: KOSAKI> so, we can eat free lunch up to 7MB ~= 60(MB/sec) * 1000 / 8.5(ms). >> >> What if the disk is busy doing other writeout or readin during this >> time? You can't assume you have the full disk bandwidth available, >> esp when you hit a swap storm like this.
Christoph> The assumptions by Kosaki are quite conservative.
Just checking
Christoph> What if one did not get a disk from the garbage heap but Christoph> instead has a state of the art storage cluster or simply an Christoph> SSD (in particular relevant now since HDs are in short Christoph> supply given the situation in Asia)?
I don't know, I was just trying to make sure he thinks about disks which are slower than he expects, since there are lots of them still out there.
John
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