Finally got around to it, kern/182818. Thanks for the encouragement.
On 10/12/12 11:14, Adam McDougall wrote:
I did not, but I put it on my list to try to accomplish.
On 10/11/12 13:41, Adrian Chadd wrote:
Did you ever file a PR for the slow SATA behaviour?
Adrian
On 11 October 2012 09:52, Adam McDougall <mcdou...@egr.msu.edu> wrote:
Be wary of the Soekris net6501, I bought three of the 1.6Ghz net6501-70
model which has an Atom E-680 cpu (E series) and it compiles more
than twice
as slow as a 1.6Ghz Atom N270 in an older netbook. Someone else
running
Linux reported similar CPU slowness. As far as practical network
throughput, I could only get 100Mbit/sec with a simple HTTP download
of a
file full of zeros, and OpenVPN could only push about 25Mbit/sec. As a
practical example of the CPU slowness, it takes about 1.5 minutes to
compile
pkg on the N270 netbook and 5 minutes on the 6501 (around 4.5 if I
use -j2).
A kernel compile took an hour. Unfortunately I had no idea this CPU
(possibly implementation?) was so slow before I purchased it, and I
could
scarcely find evidence of it on google after hours of searching when
I had
already discovered the issue. I was hoping to find some comparative
benchmarks between various Atom series but manufacturers generally
don't do
that.
Additionally, the total AHCI SATA write speed on the net6501 (in BSD
only?)
has a strange 20MB/sec limitation but reads can go over 100MB/sec.
If I
write to one disk I get 20MB/sec, if I write to both SATA disks I get
10MB/sec each. Write is equally slow on a SSD. Both someone running
OpenBSD and I running FreeBSD reported the same symptoms to the
soekris-tech
mailing list and received no useful replies towards getting that
problem
solved. I tested the write speed briefly with Linux and it did not
appear
to have the 20MB/sec limitation. I did confirm it was using
MSI(-X?) with
boot -v. I think this hardware would need to fall into Alexander
Motin's
hands to get anywhere with debugging the SATA speed issue. Since it
seems
fine in Linux, maybe some day it can be fixed in BSD but I have no
clue how
that limitation could happen. The disks I tested with are fine in
normal
computers.
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