[sugar] secure /tmp and /var/tmp
NoiseEHC at freemail.hu
Thu Nov 8 06:14:10 EST 2007
>> 2) How much can the flash drive handle per throughput AND lifetime limits?
> Throughput is dominated by compression / decompression. The latter goes
> at about 3 MB/sec; the former is probably slower.
Assuming that 50% of time is spent in decompression:
433.000.000/3.000.000/2 = 72 clocks per byte
Has anybody profiled JFFS2?
Looking at zlib_inflate_fast() in inffast.c it seems that all it does is
grabbing some bits from the input and copies bytes to the output. With
my physic debugging skills I can only conclude that the time is spent on
mispredicted branches (5-8 clocks each) and cache misses (25? each).
Probably it would worth rewriting inffast.c in asm (162 lines) once the
profiler points to that as a bottleneck.
Is read speed a bottleneck during boot or app loading?
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