Re: Performance testing with bcache

----- Original Message -----

From: "Andrew Martin" <redacted>
----- Original Message -----

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From: "Sitsofe Wheeler" <redacted>

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However, if I cat /sys/block/bcache0/bcache/cache/cache_available_percent
before and after performing the read, the value is always 100. Would
using
iflag=direct be better than iflag=nocache in this case? Is there a better
way to force data into the cache for this type of performance
benchmarking?

The amount free isn't as important as the cache hits/misses ratio.
Additionally I would recommend reading the TROUBLESHOOTING PERFORMANCE
section mentioned above and posting your findings here because the
bcache defaults often defeat first attempt synthetic benchmarking...

Thanks, I will try fio with these recommended steps!

Sitsofe,

Do you have an example fio job file that has worked well for testing bcache?

Thanks,

Andrew