Can you provide any data that shows the benefit of this? (I don't really care what app, but maybe showing the improvement that IPoIB gets?)
_____ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Slava Strebkov Sent: Wednesday, April 02, 2008 7:47 AM To: [email protected] Subject: [ofw] [PATCH] affinity options Hi, The following patch provides a way to user to specify the cpu affinity mask. Setting the value of ProcessorAffinity to FFFFFFFF binds interrupt to last cpu on machine. Why do we need this special value, versus just some CPU index value? In place of FFFFFFFF, just use 0 to get the first. Index: hw/mthca/kernel/hca_pnp.c =================================================================== --- hw/mthca/kernel/hca_pnp.c (revision 1031) +++ hw/mthca/kernel/hca_pnp.c (working copy) @@ -678,6 +678,29 @@ if( pHcaRes->Type == CmResourceTypeInterrupt ) { p_ext->interruptInfo = *pHostRes; + if ( g_processor_affinity == 0xFFFFFFFF ) + { + /* + * Calculate the mask of the last processor + */ + KAFFINITY n_active_processors_bitmask; + uint32_t last_processor_mask = 0 , tmp_processor_mask = 1; + + n_active_processors_bitmask = KeQueryActiveProcessors(); + while ( tmp_processor_mask & n_active_processors_bitmask ) + { + last_processor_mask = tmp_processor_mask; + tmp_processor_mask = tmp_processor_mask << 1; + } + p_ext->interruptInfo.u.Interrupt.Affinity = last_processor_mask; + } + else if (g_processor_affinity != 0) + { + p_ext->interruptInfo.u.Interrupt.Affinity = g_processor_affinity; + } + HCA_PRINT( TRACE_LEVEL_INFORMATION, HCA_DBG_PNP,("Set Interrupt affinity to : 0x%08X\n", + (int)p_ext->interruptInfo.u.Interrupt.Affinity )); + This is separate from this patch, but can we agree on a common definition for what a 'tab' is in this stack? - Sean
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