Re: [PATCH] Make remote transfers interruptible

[Sandra Loosemore <sandra@codesourcery.com>]

On 08/17/2015 10:00 AM, Pedro Alves wrote:
>
> I was previously assuming you were seeing this on multiple machines,
> but looking back, I only find mention of nios2.
>
> Could it be the slowdown you see is caused by some other local patches
> you might have in the tree you're using?  Do you see it with pristine FSF?

I initially saw this in a local branch, but I have been very careful to 
reproduce and test things with an unmodified FSF checkout.

> If you try your example test with gdb 7.9, with "set sysroot remote:",
> does it also take the 4 minutes to reach main?
>
> Also, can you reproduce this with other machines?  E.g., what about
> x86_64 GNU/Linux?  Wondering whether it's a kernel/libc/etc issue...

The other Linux-target build I have handy for testing right now is 
arm-none-linux-gnueabi with unmodified FSF head, testing on a 
PandaBoard.  There I found it takes about 8 seconds to start up the same 
hello-world program that takes 4 minutes on Nios II with the new sysroot 
default, and < 1 second if I do "set sysroot" first.  Aside from 
possible kernel issues or whatever, the Nios II board is theoretically a 
factor of 20 slower than the PandaBoard (processor supposedly clocked at 
10Mhz, and only one core versus 1Ghz and 2 cores for the PandaBoard), 
and the libc.so it's transferring is larger.

-Sandra