Date: Fri, 08 Mar 2013 19:05:59 +0100 From: Andre Oppermann <andre@freebsd.org> To: Garrett Wollman <wollman@freebsd.org> Cc: freebsd-net@freebsd.org, Jack Vogel <jfvogel@gmail.com> Subject: Re: Limits on jumbo mbuf cluster allocation Message-ID: <513A2887.2010408@freebsd.org> In-Reply-To: <20794.6692.191898.682241@hergotha.csail.mit.edu> References: <20793.36593.774795.720959@hergotha.csail.mit.edu> <51399926.6020201@freebsd.org> <CAFOYbc=x7U-s70KvcZJdrVP6v-On716qMi=HN1P2Kj%2Bd_K972A@mail.gmail.com> <20794.6692.191898.682241@hergotha.csail.mit.edu>
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On 08.03.2013 18:04, Garrett Wollman wrote:
> <<On Fri, 8 Mar 2013 00:31:18 -0800, Jack Vogel <jfvogel@gmail.com> said:
>
>> I am not strongly opposed to trying the 4k mbuf pool for all larger sizes,
>> Garrett maybe if you would try that on your system and see if that helps
>> you, I could envision making this a tunable at some point perhaps?
>
> If you can provide a patch I can certainly build it in to our kernel
> and have it ready the next time the production server crashes. I'd
> like it to be at least a *little* tested by someone else beforehand,
> though.
This should do the trick.
--
Andre
Index: dev/ixgbe/ixgbe.c
===================================================================
--- dev/ixgbe/ixgbe.c (revision 247893)
+++ dev/ixgbe/ixgbe.c (working copy)
@@ -1120,12 +1120,8 @@
*/
if (adapter->max_frame_size <= 2048)
adapter->rx_mbuf_sz = MCLBYTES;
- else if (adapter->max_frame_size <= 4096)
+ else
adapter->rx_mbuf_sz = MJUMPAGESIZE;
- else if (adapter->max_frame_size <= 9216)
- adapter->rx_mbuf_sz = MJUM9BYTES;
- else
- adapter->rx_mbuf_sz = MJUM16BYTES;
/* Prepare receive descriptors and buffers */
if (ixgbe_setup_receive_structures(adapter)) {
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