What is wrong with this procedure?
The filesystem partitions end up at locations that aren't even multiples of
4K. This can reduce performance. How much probably depends on the SSD.
well in my case it is a multiply of any number you like
[root@wojtek ~]# bsdlabel ada0
# /dev/ada0:
8 partiti
vm.pmap.pde.demotions: 31
No, your conclusion is incorrect. These counts show that 543 superpage
mappings were created by promotion.
OK, that sounds promising. Does "created by promotion" count reflect
historic / cumulative stats, or is vm.pmap.pde.promotions the actual number
of superpages
historic / cumulative stats, or is vm.pmap.pde.promotions the actual number
of superpages active? Or should we subtract vm.pmap.pde.demotions from it to
get the current value?
yes substracting gives current value.
___
freebsd-hackers@freebsd.org maili
How can I boot Ubuntu12.4 do with FreeBSD9 ?
when I using boot0 , Linux was shown, but would not start without a message!
Where is the problem?
can launch freebsd with Ubuntu GRUB?
How?
install ubuntu (or whatever) on one MBR partition, FreeBSD on another then
install partition selector with
what is really bad in SSD is that they are not flash chips interfaced to
computer (so flash-designed filesystem could be written) but complex hard
drive emulators. But this way they could sell this to windows users.
https://lwn.net/Articles/428584/
seems like i have it right.
i use noatime AL
You may be able to find the exact erase block size in the technical
documentation of your specific SSD. But the manufacturers don't always
tell. :)
b) small fragments (like 1KB) to reduce space usage, as there is no
seeking so it will not slow down but save space on relatively small SSD
I do
what are proper settings
a) 4kB fragments so everything is 4k aligned? SSD drives itself reports
as 512 byte blocks, but it is recomenned constantly on many places about
4K alignment for SSD.
b) small fragments (like 1KB) to reduce space usage, as there is no
seeking so it will not slow down
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