1.3.18: slow pipe performance when cpu busy

[David Rothenberger]

I've noticed slow pipe performance when my CPU is busy running 
low-priority programs (e.g., SETI@home).  For example, if I run:

% grep keychain .profile

the command completes very fast.  However, when I run

% cat .profile | grep keychain

the command takes 6-7 seconds to complete.  However, if I kill 
SETI@home, the command completes quickly.

(BTW, SETI@home is running at Low priority as reported by Windows.)

I do not have this problem if I revert back to 1.3.17.

cygcheck output is attached.  Please let me know if there's more info I 
can provide.



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