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Path: euryale.cc.adfa.oz.au!newshost.anu.edu.au!harbinger.cc.monash.edu.au!news.mira.net.au!inquo!nntp.uio.no!nntp-oslo.UNINETT.no!nntp-trd.UNINETT.no!due.unit.no!sthaug From: sthaug@nethelp.no (Steinar Haug) Newsgroups: comp.unix.bsd.freebsd.misc Subject: Glaring anomaly in lmbench results: socket bandwidth using localhost = 0.21 MB/s Date: 11 Feb 1996 14:35:48 GMT Organization: Nethelp Consulting, Trondheim, Norway Lines: 1039 Message-ID: <4fkus7$kab@stork.runit.sintef.no> NNTP-Posting-Host: trane.uninett.no I have a P133 running FreeBSD-2.1.0 release version, and I've been running some lmbench tests to see what kind of performance I have. Most results are really good (which is what I would expect!), but there is one glaring anomaly that I'd like to find out more about: Socket bandwidth using localhost (ie. a TCP connection to localhost) only gives 0.21 MBytes/s. As a comparison, pipe bandwidth is around 22 MBytes/s. The socket bandwidth result is quite reproducible. I have included the results from a full lmbench run below. Some further info: I've tried to vary the socket buffer size, and I've also tried playing around with the rfc1323 and rfc1644 variables. The result is still the same extremely low number. Hardware is a P133, 32 MByte EDO RAM, 512 kB PLB cache. OS is 2.1.0 Release version, no patches. Any good ideas about what's happing here? Steinar Haug, Nethelp consulting, sthaug@nethelp.no ---------------------------------------------------------------------- [lmbench1.0 results for FreeBSD verdi.nethelp.no 2.1.0-RELEASE FreeBSD 2.1.0-RELEASE #2: Mon Feb 5 22:26:22 MET 1996 root@:/usr/src/sys/compile/VERDI i386] [DISK: /dev/rwd0a] [FILE: /tmp/XXX] [FSDIR: /tmp] [REMOTE: ] [NETWORKS: ] [MB: 8] [Sun Feb 11 12:44:08 MET 1996] [12:44PM up 3 mins, 0 users, load averages: 0.01, 0.02, 0.00] [net: Name Mtu Network Address Ipkts Ierrs Opkts Oerrs Coll] [net: lp0* 1500 <Link> 0 0 0 0 0] [if: lp0*: flags=8810<POINTOPOINT,SIMPLEX,MULTICAST> mtu 1500] [net: de0 1500 <Link>00.00.c0.0e.69.cd 0 0 3 0 0] [if: de0: flags=8863<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST> mtu 1500] [if: inet 192.168.1.2 netmask 0xffffff00 broadcast 192.168.1.255] [if: ether 00:00:c0:0e:69:cd ] [net: de0 1500 192.168.1 verdi 0 0 3 0 0] [if: de0: flags=8863<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST> mtu 1500] [if: inet 192.168.1.2 netmask 0xffffff00 broadcast 192.168.1.255] [if: ether 00:00:c0:0e:69:cd ] [net: lo0 16384 <Link> 2 0 2 0 0] [if: lo0: flags=8009<UP,LOOPBACK,MULTICAST> mtu 16384] [if: inet 127.0.0.1 netmask 0xff000000 ] [net: lo0 16384 your-net localhost 2 0 2 0 0] [if: lo0: flags=8009<UP,LOOPBACK,MULTICAST> mtu 16384] [if: inet 127.0.0.1 netmask 0xff000000 ] [net: sl0* 552 <Link> 0 0 0 0 0] [if: sl0*: flags=c010<POINTOPOINT,LINK2,MULTICAST> mtu 552] [net: tun0* 1500 <Link> 0 0 0 0 0] [if: tun0*: flags=8010<POINTOPOINT,MULTICAST> mtu 1500] [mount: /dev/wd0a on / (local)] [mount: /dev/wd0s2f on /usr (local)] [mount: /dev/wd0s2e on /var (local)] [mount: /dev/wd2s2c on /local (local)] [mount: procfs on /proc (local)] [df: Filesystem 1K-blocks Used Avail Capacity Mounted on] [df: /dev/wd0a 32255 12793 16881 43% /] [df: /dev/wd0s2f 887983 585973 230971 72% /usr] [df: /dev/wd0s2e 30207 1677 26113 6% /var] [df: /dev/wd2s2c 1313231 343560 864612 28% /local] [df: procfs 4 4 0 100% /proc] 133.29 Mhz, 8 nanosec clock Null syscall: 8 microseconds Pipe latency: 107 microseconds UDP latency using localhost: 214 microseconds TCP latency using localhost: 259 microseconds RPC/udp latency using localhost: 355 microseconds RPC/tcp latency using localhost: 454 microseconds TCP/IP connection cost to localhost: 346 microseconds Socket bandwidth using localhost: 0.21 MB/sec Disk /dev/rwd0a latency: 563 microseconds Process fork+exit: 2446 microseconds Process fork+execve: 11033 microseconds Process fork+/bin/sh -c: 18157 microseconds Pipe bandwidth: 22.15 MB/sec Disk /dev/rwd0a bandwidth1711 KB/sec File /tmp/XXX write bandwidth: 1657 KB/sec Pagefaults on /tmp/XXX: 23 usecs "mappings 0.01 51 0.25 109 0.50 148 1.00 249 2.00 507 3.00 96 4.00 112 5.00 109 6.00 108 7.00 107 8.00 108 "read bandwidth 0.02 5.91 0.03 8.63 0.06 23.67 0.12 20.17 0.19 28.89 0.25 36.40 0.38 24.48 0.50 25.19 0.75 25.58 1.00 28.67 1.50 30.02 2.00 32.95 2.50 34.73 3.00 33.47 3.50 38.84 4.00 38.90 5.00 31.02 6.00 31.02 7.00 31.01 8.00 31.05 "Mmap read bandwidth 0.02 85.85 0.03 100.16 0.06 95.42 0.12 95.27 0.19 94.32 0.25 90.19 0.38 85.79 0.50 83.49 0.75 79.17 1.00 78.31 1.50 76.17 2.00 76.12 2.50 55.39 3.00 55.99 3.50 56.16 4.00 56.83 5.00 56.83 6.00 56.42 7.00 56.74 8.00 55.42 "libc bcopy aligned 0.0625 55.16 0.1250 52.65 0.5000 47.71 1.0000 42.56 2.0000 41.07 4.0000 40.92 8.0000 40.92 "libc bcopy unaligned 0.0625 61.76 0.1250 60.07 0.5000 49.83 1.0000 45.36 2.0000 43.59 4.0000 43.42 8.0000 43.44 "unrolled bcopy aligned 0.0625 53.83 0.1250 53.74 0.5000 44.81 1.0000 41.89 2.0000 40.17 4.0000 40.14 8.0000 40.15 "unrolled bcopy unaligned 0.0625 54.02 0.1250 52.13 0.5000 45.93 1.0000 41.78 2.0000 40.36 4.0000 40.14 8.0000 40.15 Memory read bandwidth 1.0000 82.18 2.0000 78.97 4.0000 78.88 8.0000 78.87 Memory write bandwidth 1.0000 83.22 2.0000 83.16 4.0000 83.21 8.0000 83.20 "File system latency 0k 1000 26 59 1k 1000 29 28 4k 1000 23 25 10k 1000 21 25 "size=0 ovr=30 2 26 4 28 8 30 16 31 20 32 "size=4 ovr=64 2 31 4 36 8 36 16 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