Re: FreeBSD 5.3 I/O Performance / Linux 2.6.10 | Continued Discussion

From: Robert Watson (rwatson_at_FreeBSD.org)
Date: 01/29/05

  • Next message: Mike Tancsa: "Re: FreeBSD 5.3 I/O Performance / Linux 2.6.10 | Continued Discussion" 
    Date: Sat, 29 Jan 2005 00:49:51 +0000 (GMT)
To: Mike Tancsa <mike@sentex.net>

    On Fri, 28 Jan 2005, Mike Tancsa wrote:

    > At 04:52 AM 28/01/2005, Robert Watson wrote:
    >
    > >Just to get started, using dd to read and write at various block sizes is
    > >probably a decent start. Take a few samples, make sure there's a decent
    > >sample size, etc, and don't count the first couple of runs.
    >
    >
    > I started over and installed the OS on a separate drive, so that the
    > RAID5 partition was one big partition. Bonnie seems fairly equal on the
    > 2 platforms. I am just putting together all the IOZONE tests as well
    > which I will post later tonight / over the weekend.

    The basic I/O results are encouraging. Could you remind me which storage
    controller you're using? I'm guessing some of what you're seeing is Giant
    content and a lack of preemptibility to let the disk controller interrupt
    the file system code -- this would add a lot of latency to turning around
    I/O's, lowering the throughput. Perhaps combined with issues in soft
    updates and/or UFS generally. I've CC'd Jeff Roberson since he's working
    in several of these areas.

    For postmark, could you try running the test against a partition with the
    async flag set, but no soft updates turned on? Also, could you compare
    with the sync flag on both Linux and FreeBSD (again, no soft updates)?

    Robert N M Watson

    >
    >
    >
    > -------Sequential Output-------- ---Sequential Input--
    > --Random--
    > -Per Char- --Block--- -Rewrite-- -Per Char- --Block---
    > --Seeks---
    > Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
    > F 2000 33789 25.8 34065 8.3 14038 3.8 47484 44.6 67316 9.5
    > 2873.7 5.7
    > L 2000 28073 62.0 22391 4.3 12189 2.0 17577 35.5 102132 5.5
    > 1853.7 2.5
    >
    > F=RELENG_5
    > L=2.6.10 LINUX
    >
    > However, on the postmark tests, there seems to be quite a bit more difference.
    >
    > RELENG_5 #2
    > [nfs]# time dd if=/dev/zero of=/mnt/test bs=16k count=2000
    > 32768000 bytes transferred in 0.724865 secs (45205661 bytes/sec)
    > 0.000u 0.066s 0:00.73 8.2% 33+281k 0+250io 0pf+0w
    > [nfs]# time dd if=/dev/zero of=/mnt/test bs=32k count=2000
    > 65536000 bytes transferred in 1.731888 secs (37840788 bytes/sec)
    > 0.000u 0.122s 0:01.74 6.8% 28+283k 0+500io 0pf+0w
    > [nfs]# time dd if=/dev/zero of=/mnt/test bs=64k count=2000
    > 131072000 bytes transferred in 3.131403 secs (41857273 bytes/sec)
    > 0.000u 0.245s 0:03.14 7.6% 25+335k 0+1000io 0pf+0w
    > [nfs]# time dd if=/dev/zero of=/mnt/test bs=128k count=2000
    > 262144000 bytes transferred in 6.973014 secs (37594073 bytes/sec)
    > 0.000u 0.509s 0:07.00 7.1% 26+510k 0+2000io 0pf+0w
    > [nfs]# time dd if=/dev/zero of=/mnt/test bs=256k count=2000
    > 524288000 bytes transferred in 14.253915 secs (36782035 bytes/sec)
    > 0.000u 1.003s 0:14.30 6.9% 25+784k 0+4000io 0pf+0w
    > [nfs]# time dd if=/dev/zero of=/mnt/test bs=512k count=2000
    > 1048576000 bytes transferred in 28.135716 secs (37268502 bytes/sec)
    > 0.008u 2.165s 0:28.21 7.6% 24+1386k 0+8000io 0pf+0w
    > [nfs]#
    >
    >
    > LINUX 2.6.10
    >
    > pm>set size 300 100000
    > pm>set location /mnt
    > pm>set transactions 400000
    > pm>run
    > Creating files...Done
    > Performing transactions..........Done
    > Deleting files...Done
    > Time:
    > 1504 seconds total
    > 1503 seconds of transactions (266 per second)
    >
    > Files:
    > 200107 created (133 per second)
    > Creation alone: 500 files (500 per second)
    > Mixed with transactions: 199607 files (132 per second)
    > 199905 read (133 per second)
    > 199384 appended (132 per second)
    > 200107 deleted (133 per second)
    > Deletion alone: 889 files (889 per second)
    > Mixed with transactions: 199218 files (132 per second)
    >
    > Data:
    > 12715.55 megabytes read (8.45 megabytes per second)
    > 12728.92 megabytes written (8.46 megabytes per second)
    > pm>
    >
    >
    > RELENG_5.
    > PostMark v1.5 : 3/27/01
    > pm>set location /mnt
    > pm>size 300 100000
    > Eh?
    > pm>set size 300 100000
    > pm>set location /mnt
    > pm>set transactions 400000
    > pm>run
    > Creating files...Done
    > Performing transactions..........Done
    > Deleting files...Done
    > Time:
    > 2490 seconds total
    > 2487 seconds of transactions (160 per second)
    >
    > Files:
    > 200107 created (80 per second)
    > Creation alone: 500 files (500 per second)
    > Mixed with transactions: 199607 files (80 per second)
    > 199905 read (80 per second)
    > 199384 appended (80 per second)
    > 200107 deleted (80 per second)
    > Deletion alone: 889 files (444 per second)
    > Mixed with transactions: 199218 files (80 per second)
    >
    > Data:
    > 12715.55 megabytes read (5.11 megabytes per second)
    > 12728.92 megabytes written (5.11 megabytes per second)
    > pm>
    >
    >
    >
    > RELENG_4 (Note, this was on a different partition on the RAID5 card
    >
    > pm>set size 300 100000
    > pm>set location /card0-a
    > pm>set transactions 400000
    > pm>run
    > Creating files...Done
    > Performing transactions..........Done
    > Deleting files...Done
    > Time:
    > 1219 seconds total
    > 1219 seconds of transactions (328 per second)
    >
    > Files:
    > 200107 created (164 per second)
    > Creation alone: 500 files (500 per second)
    > Mixed with transactions: 199607 files (163 per second)
    > 199905 read (163 per second)
    > 199384 appended (163 per second)
    > 200107 deleted (164 per second)
    > Deletion alone: 889 files (889 per second)
    > Mixed with transactions: 199218 files (163 per second)
    >
    > Data:
    > 12715.55 megabytes read (10.43 megabytes per second)
    > 12728.92 megabytes written (10.44 megabytes per second)
    > pm>
    >
    >
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