netdev - MSI-X resource become less and less

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Message-ID: <4A6A2125329CFD4D8CC40C9E8ABCAB9F2498091D15@MILEXCH2.ds.jdsu.net>
Date:	Wed, 26 May 2010 01:38:49 -0700
From:	Jon Zhou <Jon.Zhou@...u.com>
To:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: MSI-X resource become less and less

let's take Broadcom bnx2x as example:

first of all I can insmod bnx2x.ko multi_mode=1 num_queue=16
but when I do this:
rmmod bnx2x; insmod bnx2x.ko multi_mode=1 num_queue=8   ->OK 8 queues
rmmod bnx2x; insmod bnx2x.ko multi_mode=1 num_queue=4   ->OK 4 queues

...
finally I do this:
rmmod bnx2x; insmod bnx2x.ko multi_mode=1 num_queue=4

I found the driver can only get 1 or 2 queues! it doesn't come back to 4+ queues any longer!

MSI-X resource become less and less, any resource isn't free?

kernel:2.6.27.19
XEON 5500 16 core

thanks
jon

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