Date: Fri, 13 Mar 2015 08:34:59 -0400 From: Paul Mather <paul@gromit.dlib.vt.edu> To: Brett Wynkoop <freebsd-arm@wynn.com> Cc: "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org>, Bernd Walter <ticso@cicely7.cicely.de> Subject: Re: BeagleBone slow inbound net I/O Message-ID: <E5292790-BAE2-41BC-BC76-A31C3C7ED76B@gromit.dlib.vt.edu> In-Reply-To: <20150312232641.4365263d@ivory.wynn.com> References: <20150311165115.32327c5a@ivory.wynn.com> <20150312133433.GB28385@cicely7.cicely.de> <20150312232641.4365263d@ivory.wynn.com>
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On Mar 12, 2015, at 11:26 PM, Brett Wynkoop <freebsd-arm@wynn.com> wrote:
> Greeting-
>
> It is confirmed, the net I/O is much slower than reading from the SD
> card. Here is another run of tar - pipe - tar, but this time the
> source is the sd card and the destination is still the USB zfs.
The Beaglebone uses a USB NIC so any I/O to/from SD card will be competing for resources and potentially slowing things down.
Have you tried outputting to /dev/null to get a more accurate sense of how performant the network I/O alone is? Alternatively, how about using something like benchmarks/netperf?
I just tried transferring a big file from another system to my Beaglebone Black via "nc", piping the output to /dev/null on the Beaglebone Black, and I am maxing out the 100 Mbit connection:
pmather@beaglebone:~ % netstat -w 1 -I cpsw0
input cpsw0 output
packets errs idrops bytes packets errs bytes colls
0 0 0 12325666 0 0 269572 0
0 0 0 12302830 0 0 268372 0
0 0 0 12343768 0 0 291730 0
0 0 0 12281634 0 0 267910 0
0 0 0 12284722 0 0 267976 0
0 0 0 12320998 0 0 268768 0
0 0 0 12299862 0 0 268306 0
0 0 0 12290778 0 0 268150 0
0 0 0 12315002 0 0 268636 0
0 0 0 12269522 0 0 267646 0
0 0 0 12322572 0 0 268834 0
0 0 0 12328568 0 0 268900 0
0 0 0 12311974 0 0 268570 0
0 0 0 12281634 0 0 267910 0
0 0 0 12302890 0 0 268372 0
0 0 0 12304344 0 0 268438 0
0 0 0 12289264 0 0 268042 0
0 0 0 12311914 0 0 268570 0
0 0 0 12302890 0 0 268372 0
0 0 0 11554466 0 0 252070 0
0 0 0 12315002 0 0 268636 0
input cpsw0 output
packets errs idrops bytes packets errs bytes colls
0 0 0 12307372 0 0 268616 0
0 0 0 12289264 0 0 268042 0
0 0 0 12314942 0 0 268636 0
0 0 0 12299862 0 0 268306 0
^C
So, from my experience, inbound network I/O is as good as can be expected, at least on the Beaglebone Black.
Cheers,
Paul.
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