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Slow file copy speed on Debian Zyxel NSA325 v2 (no replies)

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Gyus any adeas where to dig?

I have latest uBoot and latest linux-4.2.0-kirkwood-tld-1-bodhi kernel.
I had all versions of kernels and uBoots it was slow on all of them.

Two hard drive inside ext4 file copy from one to another 8 MB/s, during copy 100% cpu load.
I remember when I had stock firmare and OS it was aprox 60 MB/s.

root@nas:~# hdparm -tT /dev/sdb
/dev/sdb:
 Timing cached reads:   608 MB in  2.00 seconds = 303.74 MB/sec
 Timing buffered disk reads: 382 MB in  3.01 seconds = 126.75 MB/sec
root@nas:~# hdparm -tT /dev/sda

/dev/sda:
 Timing cached reads:   592 MB in  2.00 seconds = 295.91 MB/sec
 Timing buffered disk reads: 256 MB in  3.02 seconds =  84.73 MB/sec

UUID= /media/toshiba ext4 rw,noatime,discard,data=ordered 0 2
UUID= /media/wd ext4 rw,noatime,discard,data=ordered 0 2


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