FreeBSD 5.3 I/O Performance / Linux 2.6.10 | Continued
Discussion
Robert Watson
rwatson at FreeBSD.org
Fri Jan 28 16:50:25 PST 2005
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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