On 5/29/20 1:49 PM, Yufen Yu wrote:
The 4k rand write performance drops from 100MB/S to 15MB/S?! How
about other
io sizes? Say 16k, 64K and 256K etc, it would be more convincing if
64KB stripe
has better performance than 4KB stripe overall.
Maybe I have not explain clearly. Here, the fio test result shows that
4KB
STRIPE_SIZE is not always have better performance. If applications
request
IO size mostly are bigger than 4KB, likely 1MB in test, set
STRIPE_SIZE with
a bigger value can get better performance.
So, we try to provide a configurable STRIPE_SIZE, rather than fix
STRIPE_SIZE as 4096.
Which means if you set stripe size to 64KB then you should guarantee the
io size should
always bigger then 1MB, right? Given that, I don't think it makes lots
of sense.
Anyway, just my $0.02.
Thanks,
Guoqing
