From: Petr Cervenka <[email protected]> The patch lowers significantly latency of driver/e1000e for specific hardware (eg. 82572EI), when no module parameter is explicitly specified.
Signed-off-by: Petr Cervenka <[email protected]> --- Change of default module parameter values of e1000e driver for lower latency: * TxIntDelay: 0 * TxAbsDelay: 0 * InterruptThrottleRate : 0 --- diff --git a/drivers/e1000e/param.c b/drivers/e1000e/param.c index 4dd9b63..91354fc 100644 --- a/drivers/e1000e/param.c +++ b/drivers/e1000e/param.c @@ -67,9 +67,11 @@ MODULE_PARM_DESC(copybreak, * Tx interrupt delay needs to typically be set to something non-zero * * Valid Range: 0-65535 + * + * Default Value: 0 for rtnet */ E1000_PARAM(TxIntDelay, "Transmit Interrupt Delay"); -#define DEFAULT_TIDV 8 +#define DEFAULT_TIDV 0 #define MAX_TXDELAY 0xFFFF #define MIN_TXDELAY 0 @@ -77,9 +79,11 @@ E1000_PARAM(TxIntDelay, "Transmit Interrupt Delay"); * Transmit Absolute Interrupt Delay in units of 1.024 microseconds * * Valid Range: 0-65535 + * + * Default Value: 0 for rtnet */ E1000_PARAM(TxAbsIntDelay, "Transmit Absolute Interrupt Delay"); -#define DEFAULT_TADV 32 +#define DEFAULT_TADV 0 #define MAX_TXABSDELAY 0xFFFF #define MIN_TXABSDELAY 0 @@ -106,9 +110,11 @@ E1000_PARAM(RxAbsIntDelay, "Receive Absolute Interrupt Delay"); * Interrupt Throttle Rate (interrupts/sec) * * Valid Range: 100-100000 (0=off, 1=dynamic, 3=dynamic conservative) + * + * Default Value: 0 for rtnet */ E1000_PARAM(InterruptThrottleRate, "Interrupt Throttling Rate"); -#define DEFAULT_ITR 3 +#define DEFAULT_ITR 0 #define MAX_ITR 100000 #define MIN_ITR 100 @@ -380,7 +386,7 @@ void __devinit e1000e_check_options(struct e1000_adapter *adapter) } } else { adapter->itr_setting = opt.def; - adapter->itr = 20000; + adapter->itr = 0; } } { /* Interrupt Mode */ ------------------------------------------------------------------------------ Keep Your Developer Skills Current with LearnDevNow! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-d2d _______________________________________________ RTnet-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/rtnet-developers
