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Subject: [Bug 201644] cannot set ixgbe/ix tunables - regression
Date: Fri, 17 Jul 2015 05:56:14 +0000
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X-Bugzilla-Product: Base System
X-Bugzilla-Component: kern
X-Bugzilla-Version: 10.2-BETA1
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X-Bugzilla-Severity: Affects Many People
X-Bugzilla-Who: lampa@fit.vutbr.cz
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=201644

            Bug ID: 201644
           Summary: cannot set ixgbe/ix tunables - regression
           Product: Base System
           Version: 10.2-BETA1
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: lampa@fit.vutbr.cz

/boot/loader.conf:
hw.ix.rxd="4096"
hw.ix.txd="4096"
hw.ixgbe.rxd="4096" 
hw.ixgbe.txd="4096"

sysctl hw.ix.rxd
hw.ix.rxd: 2048
SHOULD BE 4096!!!

ix0: <Intel(R) PRO/10GbE PCI-Express Network Driver, Version - 2.8.3> port
0xec00-0xec1f mem 0xf8f80000-0xf8ffffff,0xf8f7c000-0xf8f7ffff irq 32 at device
0.0 on pci5

It was working until the latest version of ixgbe driver. Tunable fetches were
deleted (why?) in the last version:

TUNABLE_INT("hw.ixgbe.rxd", &ixgbe_rxd);
SYSCTL_INT(_hw_ix, OID_AUTO, rxd, CTLFLAG_RDTUN, &ixgbe_rxd, 0,
    "Number of receive descriptors per queue");

changed to:
SYSCTL_INT(_hw_ix, OID_AUTO, txd, CTLFLAG_RDTUN, &ixgbe_rxd, 0,
     "Number of receive descriptors per queue");

and it stopped working .

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