Messages in this thread | | | Date | Mon, 14 Sep 2015 16:12:22 +0200 | Subject | Re: [PATCH 0/3] allow zram to use zbud as underlying allocator | From | Vitaly Wool <> |
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On Mon, Sep 14, 2015 at 4:01 PM, Vlastimil Babka <vbabka@suse.cz> wrote: > > On 09/14/2015 03:49 PM, Vitaly Wool wrote: >> >> While using ZRAM on a small RAM footprint devices, together with >> KSM, >> I ran into several occasions when moving pages from compressed swap back >> into the "normal" part of RAM caused significant latencies in system > > > I'm sure Minchan will want to hear the details of that :) > >> operation. By using zbud I lose in compression ratio but gain in >> determinism, lower latencies and lower fragmentation, so in the coming > > > I doubt the "lower fragmentation" part given what I've read about the design of zbud and zsmalloc?
As it turns out, I see more cases of compaction kicking in and significantly more compact_stalls with zsmalloc.
~vitaly
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