netdev - why get different number of MSI-X vector for broadcom bnx2x every time

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Date:	Fri, 14 May 2010 01:01:57 -0700
From:	Jon Zhou <Jon.Zhou@...u.com>
To:	netdev <netdev@...r.kernel.org>
Subject: why get different number of MSI-X vector for broadcom bnx2x every
 time

hi there:

bnx2x_enable_msix :

...
rc = pci_enable_msix(bp->pdev, &bp->msix_table[0],
			     BNX2X_NUM_QUEUES(bp) + offset);

	/* 
	 * reconfigure number of tx/rx queues according to available
	 * MSI-X vectors
	 */
	if (rc >= BNX2X_MIN_MSIX_VEC_CNT) {
		/* vectors available for FP */
		int fp_vec = rc - BNX2X_MSIX_VEC_FP_START;


sometimes I can run up the driver with 4 queues but most of time I can only get 2 queues
why?

May 14 01:40:16 ibm-bc-54 kernel: [bnx2x_set_num_queues:8053(eth5)]set number of queues to 15
May 14 01:40:16 ibm-bc-54 kernel: [bnx2x_enable_msix:7544(eth5)]msix_table[0].entry = 0 (slowpath)
May 14 01:40:16 ibm-bc-54 kernel: [bnx2x_enable_msix:7549(eth5)]msix_table[1].entry = 1 (CNIC)
May 14 01:40:16 ibm-bc-54 kernel: [bnx2x_enable_msix:7556(eth5)]msix_table[2].entry = 2 (fastpath #0)
May 14 01:40:16 ibm-bc-54 kernel: [bnx2x_enable_msix:7556(eth5)]msix_table[3].entry = 3 (fastpath #1)
May 14 01:40:16 ibm-bc-54 kernel: [bnx2x_enable_msix:7556(eth5)]msix_table[4].entry = 4 (fastpath #2)
May 14 01:40:16 ibm-bc-54 kernel: [bnx2x_enable_msix:7556(eth5)]msix_table[5].entry = 5 (fastpath #3)
May 14 01:40:16 ibm-bc-54 kernel: [bnx2x_enable_msix:7556(eth5)]msix_table[6].entry = 6 (fastpath #4)
May 14 01:40:16 ibm-bc-54 kernel: [bnx2x_enable_msix:7556(eth5)]msix_table[7].entry = 7 (fastpath #5)
May 14 01:40:16 ibm-bc-54 kernel: [bnx2x_enable_msix:7556(eth5)]msix_table[8].entry = 8 (fastpath #6)
May 14 01:40:16 ibm-bc-54 kernel: [bnx2x_enable_msix:7556(eth5)]msix_table[9].entry = 9 (fastpath #7)
May 14 01:40:16 ibm-bc-54 kernel: [bnx2x_enable_msix:7556(eth5)]msix_table[10].entry = 10 (fastpath #8)
May 14 01:40:16 ibm-bc-54 kernel: [bnx2x_enable_msix:7556(eth5)]msix_table[11].entry = 11 (fastpath #9)
May 14 01:40:16 ibm-bc-54 kernel: [bnx2x_enable_msix:7556(eth5)]msix_table[12].entry = 12 (fastpath #10)
May 14 01:40:16 ibm-bc-54 kernel: [bnx2x_enable_msix:7556(eth5)]msix_table[13].entry = 13 (fastpath #11)
May 14 01:40:16 ibm-bc-54 kernel: [bnx2x_enable_msix:7556(eth5)]msix_table[14].entry = 14 (fastpath #12)
May 14 01:40:16 ibm-bc-54 kernel: [bnx2x_enable_msix:7556(eth5)]msix_table[15].entry = 15 (fastpath #13)
May 14 01:40:16 ibm-bc-54 kernel: [bnx2x_enable_msix:7556(eth5)]msix_table[16].entry = 16 (fastpath #14)
May 14 01:40:16 ibm-bc-54 kernel: [bnx2x_enable_msix:7571(eth5)]Trying to use less MSI-X vectors: 4
May 14 01:40:16 ibm-bc-54 kernel: [bnx2x_enable_msix:7584(eth5)]New queue configuration set: 2
May 14 01:40:16 ibm-bc-54 kernel: bnx2x: eth5: using MSI-X  IRQs: sp 4321  fp[0] 4319 ... fp[1] 4318
May 14 01:40:16 ibm-bc-54 kernel: [bnx2x_nic_init:6067(eth5)]queue[0]:  bnx2x_init_sb(ffff8803e6810780,ffff8803f9c4f000)  cl_id 0  sb 1  cos 0
May 14 01:40:16 ibm-bc-54 kernel: [bnx2x_nic_init:6067(eth5)]queue[1]:  bnx2x_init_sb(ffff8803e6810780,ffff8803fb006000)  cl_id 1  sb 2  cos 0
May 14 01:40:16 ibm-bc-54 kernel: [bnx2x_init_rx_rings:5305(eth5)]mtu 1500  rx_buf_size 1650
 
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