slow hibernate for Debian kernels
Hi,
I always hibernate my desktop to be able to take off from where I left
off after powering off.
In doing so I discovered that the speed with which the system goes into
hibernation does not so much depend upon the number of pages involved,
although it does to a degree, but especially upon the kernel.
If you use a stock Debian kernel hibernation speed will be slow as
molasses. If you use a non-Debian kernel the speed will be 3 times faster...
The following graph compares the hibernation speeds of 2 kernels:
3.2.0-4-amd64 (labelled 3204DH) and 3.8.1-nodeb-amd64 (labelled 381NH).
The former is the stock kernel for sid/wheezy, the latter is my own
3.8.1 kernel.
http://uppix.net/9/5/6/80074a627c6c837dfbba872b3bd28.jpg
Each hibernate/resume event shows a blue symbol and a red symbol, blue
is for the read (=resume) speed and red for the write (=hibernate) speed.
Note that the reads, resumes, are more or less similar for both kernels,
but the hibernates are about 3 times slower for the Debian kernel.
I would love to know why.
Hugo
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