Date: Fri, 21 Mar 2014 08:47:35 -0300 From: Christopher Forgeron <csforgeron@gmail.com> To: Rick Macklem <rmacklem@uoguelph.ca>, Jack Vogel <jfvogel@gmail.com>, Markus Gebert <markus.gebert@hostpoint.ch> Cc: FreeBSD Net <freebsd-net@freebsd.org> Subject: Re: 9.2 ixgbe tx queue hang Message-ID: <CAB2_NwBSc3KWPYD-xbWYpRFTxpsKnXEr4V1ySP5g83aZM59MvQ@mail.gmail.com> In-Reply-To: <CAB2_NwC3on1xP3UAutkQa-3zu_JhK0%2B-ZjVb6_3NVemw2Or-KQ@mail.gmail.com> References: <CAB2_NwB=21H5pcx=Wzz5gV38eRN%2BtfwhY28m2FZhdEi6X3JE7g@mail.gmail.com> <1543350122.637684.1395368002237.JavaMail.root@uoguelph.ca> <CAB2_NwCGsAHdMFPoST05azb9K_O-K_khk3Bi1sF2om3puCcyCw@mail.gmail.com> <CAB2_NwC3on1xP3UAutkQa-3zu_JhK0%2B-ZjVb6_3NVemw2Or-KQ@mail.gmail.com>
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Hello all, I ran Jack's ixgbe MJUM9BYTES removal patch, and let iometer hammer away at the NFS store overnight - But the problem is still there. >From what I read, I think the MJUM9BYTES removal is probably good cleanup (as long as it doesn't trade performance on a lightly memory loaded system for performance on a heavily memory loaded system). If I can stabilize my system, I may attempt those benchmarks. I think the fix will be obvious at boot for me - My 9.2 has a 'clean' netstat - Until I can boot and see a 'netstat -m' that looks similar to that, I'm going to have this problem. Markus: Do your systems show denied mbufs at boot like mine does? Turning off TSO works for me, but at a performance hit. I'll compile Rick's patch (and extra debugging) this morning and let you know soon. On Thu, Mar 20, 2014 at 11:47 PM, Christopher Forgeron <csforgeron@gmail.com > wrote: > BTW - I think this will end up being a TSO issue, not the patch that Jack > applied. > > When I boot Jack's patch (MJUM9BYTES removal) this is what netstat -m > shows: > > 21489/2886/24375 mbufs in use (current/cache/total) > 4080/626/4706/6127254 mbuf clusters in use (current/cache/total/max) > 4080/587 mbuf+clusters out of packet secondary zone in use (current/cache) > 16384/50/16434/3063627 4k (page size) jumbo clusters in use > (current/cache/total/max) > 0/0/0/907741 9k jumbo clusters in use (current/cache/total/max) > > 0/0/0/510604 16k jumbo clusters in use (current/cache/total/max) > 79068K/2173K/81241K bytes allocated to network (current/cache/total) > 18831/545/4542 requests for mbufs denied (mbufs/clusters/mbuf+clusters) > > 0/0/0 requests for mbufs delayed (mbufs/clusters/mbuf+clusters) > 0/0/0 requests for jumbo clusters delayed (4k/9k/16k) > 15626/0/0 requests for jumbo clusters denied (4k/9k/16k) > > 0 requests for sfbufs denied > 0 requests for sfbufs delayed > 0 requests for I/O initiated by sendfile > > Here is an un-patched boot: > > 21550/7400/28950 mbufs in use (current/cache/total) > 4080/3760/7840/6127254 mbuf clusters in use (current/cache/total/max) > 4080/2769 mbuf+clusters out of packet secondary zone in use (current/cache) > 0/42/42/3063627 4k (page size) jumbo clusters in use > (current/cache/total/max) > 16439/129/16568/907741 9k jumbo clusters in use (current/cache/total/max) > > 0/0/0/510604 16k jumbo clusters in use (current/cache/total/max) > 161498K/10699K/172197K bytes allocated to network (current/cache/total) > 18345/155/4099 requests for mbufs denied (mbufs/clusters/mbuf+clusters) > > 0/0/0 requests for mbufs delayed (mbufs/clusters/mbuf+clusters) > 0/0/0 requests for jumbo clusters delayed (4k/9k/16k) > 3/3723/0 requests for jumbo clusters denied (4k/9k/16k) > > 0 requests for sfbufs denied > 0 requests for sfbufs delayed > 0 requests for I/O initiated by sendfile > > > > See how removing the MJUM9BYTES is just pushing the problem from the 9k > jumbo cluster into the 4k jumbo cluster? > > Compare this to my FreeBSD 9.2 STABLE machine from ~ Dec 2013 : Exact same > hardware, revisions, zpool size, etc. Just it's running an older FreeBSD. > > # uname -a > FreeBSD SAN1.XXXXX 9.2-STABLE FreeBSD 9.2-STABLE #0: Wed Dec 25 15:12:14 > AST 2013 aatech@FreeBSD-Update Server:/usr/obj/usr/src/sys/GENERIC > amd64 > > root@SAN1:/san1 # uptime > 7:44AM up 58 days, 38 mins, 4 users, load averages: 0.42, 0.80, 0.91 > > root@SAN1:/san1 # netstat -m > 37930/15755/53685 mbufs in use (current/cache/total) > 4080/10996/15076/524288 mbuf clusters in use (current/cache/total/max) > 4080/5775 mbuf+clusters out of packet secondary zone in use (current/cache) > 0/692/692/262144 4k (page size) jumbo clusters in use > (current/cache/total/max) > 32773/4257/37030/96000 9k jumbo clusters in use (current/cache/total/max) > > 0/0/0/508538 16k jumbo clusters in use (current/cache/total/max) > 312599K/67011K/379611K bytes allocated to network (current/cache/total) > > 0/0/0 requests for mbufs denied (mbufs/clusters/mbuf+clusters) > 0/0/0 requests for mbufs delayed (mbufs/clusters/mbuf+clusters) > 0/0/0 requests for jumbo clusters delayed (4k/9k/16k) > 0/0/0 requests for jumbo clusters denied (4k/9k/16k) > 0/0/0 sfbufs in use (current/peak/max) > 0 requests for sfbufs denied > 0 requests for sfbufs delayed > 0 requests for I/O initiated by sendfile > 0 calls to protocol drain routines > > Lastly, please note this link: > > http://lists.freebsd.org/pipermail/freebsd-net/2012-October/033660.html > > It's so old that I assume the TSO leak that he speaks of has been patched, > but perhaps not. More things to look into tomorrow. > >
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