>malloc(M_NOWAIT) fails whenever free physical memory is not enough. 
>FreeBSD should be similar to NetBSD in this point. But this situation
>is very rare in both systems, since paging system is always making
>effort to reserve some free physical memory.

Perhaps FreeBSD is more agressive in maintaining a free pool.  You
need slightly more than 2k free to allocate a new SCB.  I might
reduce the size of the SG list to help reduce this problem since
we currently can't send more than 64k at a time.

>--
>soda@sra.co.jp		Software Research Associates, Inc., Japan
>(Noriyuki Soda)		   software tools and technology group

--
Justin T. Gibbs
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  FreeBSD: Turning PCs into workstations
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