Date: Tue, 19 Oct 2004 20:31:05 +0200 From: Emanuel Strobl <Emanuel.Strobl@gmx.net> To: freebsd-current@freebsd.org, fandino@ng.fadesa.es Subject: Re: FreeBSD 5.3b7and poor ata performance Message-ID: <200410192031.12504.Emanuel.Strobl@gmx.net> In-Reply-To: <41715DE3.90002@ng.fadesa.es> References: <20041015190638.C5A0E5D04@ptavv.es.net> <41715DE3.90002@ng.fadesa.es>
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Am Samstag, 16. Oktober 2004 19:44 schrieb fandino:
[...]
> > Also, make sure that disk write-cache is enabled on both or disabled on
> > both.
>
> write-cache was enable on all tests and disks were in UDMA5 mode.
>
> In this new round of tests I add FreeBSD witch async and OpenBSD (always
> using the same hardware). FreeBSD is by far, the worst throughput of all
> (about 50% slower than others) :-?
>
> GNU/Linux 2.4.18 with ext2: 56848 K/sec
> FreeBSD 5.3b7 with default fs: 26347 K/sec
> FreeBSD 5.3b7 with default fs(async): 26566 K/sec
> FreeBSD 5.3b7 ata raid0* (two disks): 26131 K/sec
> FreeBSD 5.3b7 geom stripe* (two disks): 30063 K/sec
> FreeBSD 5.3b7 geom stripe** (four disks): 31891 K/sec
> OpenBSD 3.5 UFS fs: 55277 K/sec
>
> * Each disk of the raid had a throughput of approx. 15000 K/sec
> ** Each disk of the raid had a throughput of approx. 7500 K/sec
> Each disk of the read split the throughput by half.
>
> How is possible that FreeBSD performs as bad?
I have to confirm that I also have even worse transfer rates.
It's a ICH2 (i815e) with a not so brand new 80GB WD, but I'd expext about=20
50MB/s and I get 16MB/s.
One interesting thing is that the transferrate is constant with blocksizes=
=20
from 256 Byte on. Only with a blocksize of 128 Bytes I can see reduced=20
throughput (10MB/s).
I can remember, when I last did such "esoteric" tests throughput reached=20
maximum at about 16k blocksize and rapidly degraded with blocksizes smaller=
=20
than 10k. But now only very very small blocksizes limit the throughput!
Some excerpts: (i815 ich2, 5.3-RC1, custom kernel)
cale:/usr#22: atacontrol mode 0
Master =3D UDMA100
Slave =3D BIOSPIO
ATA channel 0:
Master: ad0 <WDC WD800AB-00CBA0/03.06A03> ATA/ATAPI revision 5
atapci0: <Intel ICH2 UDMA100 controller> port=20
0xffa0-0xffaf,0x376,0x170-0x177,0x3f6,0x1f0-0x1f7 at device 31.1 on pci0
ata0: channel #0 on atapci0
ata1: channel #1 on atapci0
cale:/usr#25: uname -a
=46reeBSD cale.flintsbach.schmalzbauer.de 5.3-STABLE FreeBSD 5.3-STABLE #4:=
Sun=20
Oct 17 02:33:58 CEST 2004 =20
root@cale.flintsbach.schmalzbauer.de:/usr/obj/usr/src/sys/CALE i386
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