Re: FreeBSD 5.3b7and poor ata performance

Hello,

Søren Schmidt wrote:
> Transfer rates:
>         outside:       102400 kbytes in   1.933641 sec =    52957 
> kbytes/sec
>         middle:        102400 kbytes in   1.934147 sec =    52943 
> kbytes/sec
>         inside:        102400 kbytes in   2.761984 sec =    37075 
> kbytes/sec
> 
> 
> Mind you this server is active as mail/www/gateway so the numbers are to 
> be taken with a bit of salt, and that Maxtor disk is probably the 
> slowest disk they make at all these days, anyhow the numbers above fits 
> the specs pretty close...

Thanks to the excelent job of Thomas Sparrevohn I get 52MB/s, this is
an excerpt of their comments:

"Changes the DMA speed to 66 - The Controller is a 100 controller and the disks
are 100 Disks but I think the default for the controller is 66 and hence
there are most likely a small initialisation difference between Linux, NetBSD
and FreeBSD"

# diskinfo -t ad5
ad5
....
Transfer rates:
	outside:       102400 kbytes in   1.897858 sec =    53956 kbytes/sec
	middle:        102400 kbytes in   1.934135 sec =    52944 kbytes/sec
	inside:        102400 kbytes in   2.735875 sec =    37429 kbytes/sec

Soren whilst that this solution doesn't makes sense it is fine to me :-)

Poul, now I'm using gstripe with two disks (52 MB/s by disk) and diskinfo
reports a final throughput of 40MB/s. is it normal with gstripe?

# diskinfo -t /dev/stripe/test
/dev/stripe/test
.....
Transfer rates:
	outside:       102400 kbytes in   2.529268 sec =    40486 kbytes/sec
	middle:        102400 kbytes in   2.524635 sec =    40560 kbytes/sec
	inside:        102400 kbytes in   2.524111 sec =    40569 kbytes/sec


# gstripe list
Geom name: test
State: UP
Status: Total=2, Online=2
Type: AUTOMATIC
Stripesize: 4096
ID: 3854451486
Providers:
1. Name: stripe/test
    Mediasize: 82220277760 (77G)
    Sectorsize: 512
    Mode: r0w0e0
Consumers:
1. Name: ad5
    Mediasize: 41110142976 (38G)
    Sectorsize: 512
    Mode: r0w0e0
    Number: 0
2. Name: ad7
    Mediasize: 41110142976 (38G)
    Sectorsize: 512
    Mode: r0w0e0
    Number: 1