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What's the decision behind not testing Samsung with "On On" cache and barriers? Is it so much slower that it's not worth testing? Shouldn't barriers allow the c
by acqq 11y ago
What's the decision behind not testing Samsung with "On On" cache and barriers? Is it so much slower that it's not worth testing? Shouldn't barriers allow the cache on the disk to "know better" how to organize writes and still be faster than without the cache turned on?
The "disk cache" is a disk hardware option (how it uses its own RAM), if I understood, and the barriers are just an option of the FS behavior (software). I'd expect that the performance penalty to the former is much higher than to the later?
- kustodian 11y agoThe reason is the performance penalty for barriers On + disk cache On was much higher than for barriers Off + Disk Cache off, at least that is how it looked like on our testing system. Of course that could be do to the fact that we are using a RAID controller which has a 1GB of cache. If you are not using RAID, "On On" would be a valid test.