[Yaffs] Percent usage affects write performance

Hello,

I'm run into problem with yaffs2 usage.
When yaffs2 was only created(0% usage), I have write performance about
~1Mb/sec.
When usage increased to 40-50%, I have only 450-500Kb/sec.
When usage increased to 95-99%, it's only 50-90Kb/sec. :-()

My test is very simple, just copy 1Mb file from mem to yaffs2:
time cp /test.txt /usr/local

/usr/local is yaffs2, / - is initramfs.

Is there any reason for that? Maybe it's some GC related things and it's
normal behaviour?


--
Nickolay Vinogradov