Comment 139 for bug 1518457
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| velis (jure-erznoznik-gmail) wrote | #139 |
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0f7b58d
(Get the code!)
Following this thread I had the same issue, running stock 16.04 (xenial) with kernel 4.4.0-38.
I have upgraded the kernel to 4.8.10-040810 and the end result is the same but symptoms are a bit different:
note: 1GB of RAM, no swap at all
(old kernel)
with 50% of RAM in buffers / cache, kswapd0 took all the CPU it could (~75%). iostat was pretty much at 0% utilisation. server ground to a halt immediately when free ram expired without ever "eating into" the buffers / cache.
(new kernel)
again, with 50% of RAM in buffers / cache, kswapd0 no longer takes 100% CPU, but it still emerges to the top of the list in top as it still manages to take more then the other processes. For a difference, now ~75% cpu processes are *WA*iting. A second difference is that now, after free ram is consumed, for a while buffers / cache are also being reduced in favour of the RAM hungry app. However, even this goes only down to about 40 - 43% or RAM being used by buffers / cache.
Hopefully this is making at least some sense.