Hi all,
I've been upgrading to a recent kernel ( for one of our boards). { Running on a 1- Ghz ARM single core CPU}
And I'm having an issue that keeps me busy for some days.
"sync" seems to take VERY long to complete. ( the whole system seems to freeze, so that finally the WATDOG triggers a reset)
There is no disk activity ( logs are stored on tmpfs ) ... .!
On a recent 4.4.61 kernel the time measured for the "sync" seems often to be more than 5 seconds ( up to 30 seconds).
# /usr/bin/time sync;
real 0m 8.01s
user 0m 0.00s
sys 0m 0.01s
{ fyi: system load with 'TOP' is less than 2%, I've been trying 4.4.43 and 4.4.61 .. both have the same 'behavoir'}
On an older 2.6.35.x kernel ( the kernel has been rebuild) I have this behavior.
# /usr/bin/time sync;
real 0m 0.01s
user 0m 0.00s
sys 0m 0.01s
I'm using same root-filesystem, for both builds (the only change is another (upgraded) kernel version) -> must be kernel related.
I'm using the same file systems , I've been trying ext2,ubifs, even FAT .
Old-2.6.35.x-Kernel : sync - time very good ( acceptable)
NEW-4.4.x-Kernel : sync - time .. BAD .. takes way to long. !!!
Any clue what could be the cause , or any hints that could explain ( and solve ?) this ..
Best Regards
Noel
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