Re: slow tar performance on fbsd5

From: Divacky Roman (xdivac02_at_stud.fit.vutbr.cz)
Date: 08/25/05

  • Next message: JG: "Re[6]: slow tar performance on fbsd5" 
    Date: Thu, 25 Aug 2005 11:29:57 +0200
To: JG <jarek@adeon.lublin.pl>

    cannot this be related to low value of nswbufs (fixed in curennt and I think
    releng_6)?

    On Wed, Aug 24, 2005 at 06:33:57PM +0200, JG wrote:
    > Hello,
    >
    > I had to unpack a lot of tar archives and I occasional noticed terrible
    > bad performance on freebsd5.
    >
    > This is my test file:
    >
    > 854251520 24 Sie 12:13 mysql-m.tgz
    >
    > There are some real MySQL tables in it, it has been done with tar
    > -cvf. This archive contains about 146.000 small files.
    >
    > ---------------------------------------
    > Unpacking it on FreeBSD5 gives me such results:
    >
    > # time tar -xf mysql-m.tgz
    > 2.130u 20.187s 7:02.69 5.2% 41+382k 13097+8205io 0pf+0w
    > ...so 7 minutes of real time.
    >
    > This is today's FreeBSD 5.4-STABLE but I also tried 5.4-release.
    >
    > That server is brand new Dell PE2850 with Seagate ST373207L SCSI
    > drive, no raid. Parition is default UFS2 mounted with noatime, softupdates on.
    > This is Dual Xeon 2.8, 2GB ram.
    >
    > My sysctls:
    > vfs.ufs.dirhash_maxmem=16777216 (much better than default 2MB)
    > machdep.hyperthreading_allowed=1 (better dd results)
    > kern.maxfiles=65536
    > kern.maxfilesperproc=65536
    > vfs.read_max=16
    >
    > I've tried a few different kernels - I had results like 6-15 minutes
    > of real time. 6 minutes was the best.
    >
    > I've also tried standard sysctls, and with/without make.conf cputype.
    > I've tested bsdtar and gtar from ports (btw. gtar seems to be faster).
    >
    > I didn't noticed slowness of any other things on this server. I've quiet good DD results.
    >
    > Diskinfo shows:
    > # diskinfo -tv /dev/da3s1d
    > /dev/da3s1d
    > 512 # sectorsize
    > 73402366464 # mediasize in bytes (68G)
    > 143363997 # mediasize in sectors
    > 8923 # Cylinders according to firmware.
    > 255 # Heads according to firmware.
    > 63 # Sectors according to firmware.
    >
    > Seek times:
    > Full stroke: 250 iter in 3.107691 sec = 12.431 msec
    > Half stroke: 250 iter in 2.223141 sec = 8.893 msec
    > Quarter stroke: 500 iter in 3.595413 sec = 7.191 msec
    > Short forward: 400 iter in 1.832164 sec = 4.580 msec
    > Short backward: 400 iter in 2.047162 sec = 5.118 msec
    > Seq outer: 2048 iter in 0.315528 sec = 0.154 msec
    > Seq inner: 2048 iter in 0.320899 sec = 0.157 msec
    > Transfer rates:
    > outside: 102400 kbytes in 1.341191 sec = 76350 kbytes/sec
    > middle: 102400 kbytes in 1.536625 sec = 66640 kbytes/sec
    > inside: 102400 kbytes in 2.731570 sec = 37488 kbytes/sec
    >
    >
    > Soon I'll be able to post results from my other server powered by
    > FreeBSD 4.11 with poor SCSI, maybe in the night.
    >
    > ----------------------------------------
    > This is result from Gentoo Linux on 2.6.x hardened kernel:
    > # time tar -xf mysql-m.tgz
    >
    > real 1m3.944s
    > user 0m1.702s
    > sys 0m15.794s
    >
    > Only ~one minute! Six times faster than on a FreeBSD. I'm not a linux
    > fan, and I don't want to tell you how good linux is, but I would to
    > find out what causes such bad results on my favourite FreeBSD...
    >
    > This one is noname server with Dual Xeon 2.8, 2GB ram. It has
    > SATA Maxtor drive. Partition is ext3 -T news, -O dir_index, with
    > atime! I've similar results with ReiserFS.
    >
    > ------------------------------------------
    >
    > Both systems was good optimized - as good as I can. All services (like
    > mysql, apache) was terminated before my tests. Both FreeBSD's
    > locate.updatedb and Gentoo's updatedb disabled.
    >
    >
    > Thank you for any opinions or hints how to tune FreeBSD a bit.
    >
    > Best Regards,
    > JG
    >
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