Date: Wed, 22 Feb 2012 11:56:29 -0800 From: Jack Vogel <jfvogel@gmail.com> To: FreeBSD Net <freebsd-net@freebsd.org>, FreeBSD stable <freebsd-stable@freebsd.org>, re <re@freebsd.org> Subject: nmbclusters: how do we want to fix this for 8.3 ? Message-ID: <CAFOYbc=oU5DxZDZQZZe4wJhVDoP=ocVOnpDq7bT=HbVkAjffLQ@mail.gmail.com>
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Using igb and/or ixgbe on a reasonably powered server requires 1K mbuf clusters per MSIX vector, that's how many are in a ring. Either driver will configure 8 queues on a system with that many or more cores, so 8K clusters per port... My test engineer has a system with 2 igb ports, and 2 10G ixgbe, this is hardly heavy duty, and yet this exceeds the default mbuf pool on the installed kernel (1024 + maxusers * 64). Now, this can be immediately fixed by a sysadmin after that first boot, but it does result in the second driver that gets started to complain about inadequate buffers. I think the default calculation is dated and should be changed, but am not sure the best way, so are there suggestions/opinions about this, and might we get it fixed before 8.3 is baked? Cheers, Jack
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