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1ad6cc0c62
This patchset brings some performance improvements and the addition of the LZO-RLE
algorithm to the kernel, also usable in zram (yup, tested, works but LZ4 is still ok for us).
The main performance improvement is for SWAP space: the locking has changed and
the swap cache is now split in 64MB trunks.
This gives us a reduction of the median page fault latency of 375%, from 15uS to 4uS,
and an improvement of 192% on the swap throughput (this includes "virtual" swap
devices, like zRAM!). The real world user experience improvement of this on a mobile
device is seen after a day or two of usage, where it usually starts losing just a little
performance due to the large amount of apps kept open in background: now I cannot
notice any more performance loss and the user experience is now basically the same as
if the phone was in its first 2 hours of boot life.
Other performance improvements include, in short:
UDP v4/v6: 10% more performance on single RX queue
Userspace applications will be faster when checking running time of threads
2-5% improvements on heavy multipliers (yeah, not a lot, but was totally free...)
Improvements on rare conditions during sparsetruncate of about 0.3% to a
way more rare around 20% improvement (that's never gonna happen, but there
is no performance drop anywhere).
Tested on SoMC Tama Akatsuki RoW
This was taken from
Repo:
https://github.com/sonyxperiadev/kernel
PR: 2039 ([2.3.2.r1.4] Performance improvements)