Date: Wed, 4 Feb 2009 13:40:03 GMT From: Martin Birgmeier <martin@email.aon.at> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/131360: [nfs] poor scaling behavior of the NFS server under load Message-ID: <200902041340.n14De3Cs091891@freefall.freebsd.org>
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The following reply was made to PR kern/131360; it has been noted by GNATS. From: Martin Birgmeier <martin@email.aon.at> To: bug-followup@FreeBSD.org Cc: Subject: Re: kern/131360: [nfs] poor scaling behavior of the NFS server under load Date: Wed, 4 Feb 2009 14:38:06 +0100 (CET) I just realized that there might also be an interaction with pppoa2 (from /usr/ports/net/pppoa). The excessive load seems to happen more likely if at the same time I have heavy traffic through my ADSL connection, which goes through an Alcatel ADSL modem, pppoa2, and user-mode ppp. Syslog will continually show the following message: Feb 4 13:56:59 gandalf pppoa2[1491]: write_dest: 11800 ENOBUFS errors Feb 4 13:57:03 gandalf pppoa2[1491]: write_dest: 11900 ENOBUFS errors Feb 4 13:57:08 gandalf pppoa2[1491]: write_dest: 12000 ENOBUFS errors Feb 4 13:57:11 gandalf pppoa2[1491]: write_dest: 12100 ENOBUFS errors Feb 4 13:57:15 gandalf pppoa2[1491]: write_dest: 12200 ENOBUFS errors At the same time, netstat -m shows the following: # netstat -m 233/412/645 mbufs in use (current/cache/total) 207/241/448/25600 mbuf clusters in use (current/cache/total/max) 204/180 mbuf+clusters out of packet secondary zone in use (current/cache) 1/19/20/12800 4k (page size) jumbo clusters in use (current/cache/total/max) 0/0/0/6400 9k jumbo clusters in use (current/cache/total/max) 0/0/0/3200 16k jumbo clusters in use (current/cache/total/max) 476K/661K/1137K bytes allocated to network (current/cache/total) 0/0/0 requests for mbufs denied (mbufs/clusters/mbuf+clusters) 0/0/0 requests for jumbo clusters denied (4k/9k/16k) 0/5/6656 sfbufs in use (current/peak/max) 0 requests for sfbufs denied 0 requests for sfbufs delayed 15 requests for I/O initiated by sendfile 0 calls to protocol drain routines
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