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sfc: Implement adaptive IRQ moderation

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Calculate a score for each 1000 IRQs:
- TX completions are worth 1 point
- RX completions are worth 4 if merged using LRO or 2 otherwise

Reduce moderation if the score is less than 10000, down to a minimum
of 5 us.  Increase moderation if the score is more than 20000, up to
the specified maximum.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ben Hutchings
2009-03-20 13:30:37 +00:00
committed by David S. Miller
parent 85451a951b
commit 6fb70fd1b5
6 changed files with 73 additions and 21 deletions
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2
drivers/net/sfc/falcon.h
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@@ -85,6 +85,8 @@ extern void falcon_set_int_moderation(struct efx_channel *channel);
extern void falcon_disable_interrupts(struct efx_nic *efx);
extern void falcon_fini_interrupt(struct efx_nic *efx);
#define FALCON_IRQ_MOD_RESOLUTION 5
/* Global Resources */
extern int falcon_probe_nic(struct efx_nic *efx);
extern int falcon_probe_resources(struct efx_nic *efx);