The reason for slow USB performance on Sun Ray is that, in order to
remove the need for multiple custom firmware drivers, the USB protocol
is expressed directly over the network between client and server (except
for keyboard and mouse which are handled in firmware). It's the server
that processes the "raw" USB stream. USB protocol is defined for an
extremely low-latency bus, and as such has very small maximum transfer
sizes, and the protocol is synchronous. When translated to a
higher-latency bus like ethernet, the overall throughput is greatly
reduced by the inter-packet latencies.
-Bob
David Markey wrote:
Ok it seems that using samba doesn't make a difference when copying off
a USB key mounted on the server. It took 26 minutes via samba and about
the same via RDP redirection to copy a 330MB file from my USB key.
The biggest bottleneck lies somewhere between the DTU and the SunRay
server, or I heard that the pcfs implementation on Solaris has issues
aswell.
It's really quite strange that the USB throughput over a 100mbit pipe is
as low as ~12MB/min, I did a quick test and i was getting 11.21MB/s over
FTP to the sunray server(from the same location that my DTU is) so i'm
ruling out a slow network.
Does everyone else routinely experience USB performance similar to this?
Thanks.
David
David Markey wrote:
Not really, But i did do the samba test 1st so in theory RDP had the
advantage by having the file buffered for the 2nd test?
John Francis wrote:
2009/3/28 David Markey <[email protected]>:
It took 7 seconds via samba to copy the file and 29 seconds via RDP.
Did you take into account file system buffers? For example, before
running either test did you do a "cat myfile > /dev/null" to make sure
it was likely pre-loaded into RAM?
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