Probably a dumb q about scp and buffers

[Christopher Rapier]

So I was running strace against sshd -D during an scp transfer. I 
noticed that the scp child was using a buffer size of 4k for its IO 
while the sshd notty was using a 16k buffer. Which seems to imply that 
scp is making 4 read/writes for every 1 read/write that sshd is making. 
If increase amount being read/wrote by scp to 16k then I seem to 
eliminate 6 system calls per 16k of data.

By no means do I understand all the implications of making this change 
in terms of security which is why I'm asking here. Does this seem like a 
sensible change to make or should it make no noticable difference (using 
the time command seems to indicate that we spend 15% to 25% less time in 
the kernel though).

Any thoughts? Feel free to shoot this down, I'm really just poking 
around at things and this popped into my head.

Chris