Performance with write cache on hp smart array p410i ?

I use the hp smart array p410i without write cache because there is no battery inside...

I did a shot test:



##### Proxmox - Performance on HP ML350 G6 #####


## without write cache ##

pveperf

CPU BOGOMIPS: 17062.84
REGEX/SECOND: 854697
HD SIZE: 19.69 GB (/dev/mapper/pve-root)
BUFFERED READS: 540.29 MB/sec
AVERAGE SEEK TIME: 6.64 ms
FSYNCS/SECOND: 50.59
DNS EXT: 35.61 ms
DNS INT: 13.02 ms (domain.at)

pveperf

CPU BOGOMIPS: 17062.84
REGEX/SECOND: 831907
HD SIZE: 19.69 GB (/dev/mapper/pve-root)
BUFFERED READS: 715.44 MB/sec
AVERAGE SEEK TIME: 5.08 ms
FSYNCS/SECOND: 52.30
DNS EXT: 43.28 ms
DNS INT: 17.12 ms (domain.at)


pveperf

CPU BOGOMIPS: 17062.84
REGEX/SECOND: 853512
HD SIZE: 19.69 GB (/dev/mapper/pve-root)
BUFFERED READS: 723.48 MB/sec
AVERAGE SEEK TIME: 4.90 ms
FSYNCS/SECOND: 46.35
DNS EXT: 39.57 ms
DNS INT: 13.35 ms (domain.at)




If write cache is enabled, how many percent could it be better ?