Re: NFS on Raspberry Pi high load

[Sven Hartge <sven@svenhartge.de>]

Bob Proulx <bob@proulx.com> wrote:

> I don't know about the new Raspberry quad core.  Does it have the same
> limited usb chip as the original?

It does. But because the CPU is more powerful (and you have 4 cores) you
can squeeze about 95MBit/s out of it.

Right now I am dd'ing a 600MB file over NFS (the Raspi2 is the client) to
/dev/null and the transfer rate (measured on the server) is stable at
96.7MBite/s, but one core is fully occupied with the transfer and the
dd-process is mostly in the D-state and does not use much CPU at all
(about 1% according to top).

Final results:

(with not special blocksize setting):
1273709+1 records in
1273709+1 records out
652139386 bytes (621.9MB) copied, 55.460434 seconds, 11.2MB/s
real    0m 55.46s
user    0m 0.75s
sys     0m 6.31s

(with bs=4M):
155+1 records in
155+1 records out
652139386 bytes (621.9MB) copied, 55.431787 seconds, 11.2MB/s
real    0m 55.44s
user    0m 0.00s
sys     0m 2.68s

Copying the same file to the SDHC card takes a little bit longer, but
not much:
real    1m 1.91s
user    0m 0.13s
sys     0m 8.12s

Grüße,
Sven.

-- 
Sigmentation fault. Core dumped.