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Commit a27fc96b authored by Ben Hutchings's avatar Ben Hutchings Committed by David S. Miller
Browse files

ethtool: Note common alternate exit condition for interrupt coalescing 



Many implementations ignore the value of max_frames and do not
treat usecs == 0 as special.  Document this as deprecated.

Signed-off-by: default avatarBen Hutchings <bhutchings@solarflare.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent acf42a2a

include/linux/ethtool.h

+6 −0
Original line number Diff line number Diff line
@@ -173,6 +173,12 @@ struct ethtool_eeprom { 
 * would cause interrupts to never be generated.  To disable

 * coalescing, set usecs = 0 and max_frames = 1.

 *

 * Some implementations ignore the value of max_frames and use the

 * condition:

 *	time_since_first_completion >= usecs

 * This is deprecated.  Drivers for hardware that does not support

 * counting completions should validate that max_frames == !rx_usecs.

 *

 * Adaptive RX/TX coalescing is an algorithm implemented by some

 * drivers to improve latency under low packet rates and improve

 * throughput under high packet rates.  Some drivers only implement