FreeBSD Bugzilla – Attachment 112334 Details for
Bug 153738
[patch] Docuement requirement to alter some sysctls when using igb(4) with jumbo frames.
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igb.4.txt
igb.4.txt (text/plain), 822 bytes, created by
Tom Judge
on 2011-01-06 18:20:05 UTC
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Description:
igb.4.txt
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Creator:
Tom Judge
Created:
2011-01-06 18:20:05 UTC
Size:
822 bytes
patch
obsolete
>Index: igb.4 >=================================================================== >--- igb.4 (revision 216409) >+++ igb.4 (working copy) >@@ -161,6 +161,18 @@ > If set to 1, enable Adaptive Interrupt Moderation. > The default is to enable Adaptive Interrupt Moderation. > .El >+.Pp >+If using jumbo frames with this driver, it is worth >+configuring the following sysctls, as the default settings >+for the card will require more resources than the default. >+.Bl -tag -width indent >+.It Va kern.ipc.nmbclusters >+The maximum number of mbuf clusters allowed. >+.It Va kern.ipc.nmbjumbo9k >+The maximum number of mbuf 9k jumbo clusters allowed. >+Increasing this to allow for at least 8192 extra clusters >+per interface should allow for an mtu of 8192. >+.El > .Sh DIAGNOSTICS > .Bl -diag > .It "igb%d: Unable to allocate bus resource: memory"
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