Date: Mon, 20 Sep 1999 10:46:01 +0200 From: Jesper Skriver <jesper@skriver.dk> To: Poul-Henning Kamp <phk@critter.freebsd.dk>, Matthew Dillon <dillon@apollo.backplane.com> Cc: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: User block device access (was: cvs commit: src/sys/miscfs/specfs spec_vnops.c src/sys/sys vnode.h src/sys/kern vfs_subr.c) Message-ID: <19990920104601.B75298@skriver.dk> In-Reply-To: <18011.937771504@critter.freebsd.dk>; from Poul-Henning Kamp on Sun, Sep 19, 1999 at 10:05:04PM %2B0200 References: <Pine.BSF.4.05.9909191254200.42176-100000@semuta.feral.com> <18011.937771504@critter.freebsd.dk>
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On Sun, Sep 19, 1999 at 10:05:04PM +0200, Poul-Henning Kamp wrote:
> In message <Pine.BSF.4.05.9909191254200.42176-100000@semuta.feral.com>, Matthew
> Jacob writes:
>
> >
> >Okay, then. Really, seriously, though- if we're all stuck arguing a
> >major issue from different viewpoints for lack of < 1K$ equipment, this is
> >an easy problem to solve from the K$ point of view (hadn't thought about
> >customs- I guess I just can't express mail these puppies, can I? :-))
>
> You know, only Matt Dillon thought this was a hardware issue, I don't
> think it is.
I see the same a Poul-Henning
# time dd if=/dev/rda0 of=/dev/null bs=8k count=10000
10000+0 records in
10000+0 records out
81920000 bytes transferred in 6.293370 secs (13016873 bytes/sec)
6.30s real 0.04s user 0.46s system
# time dd if=/dev/da0 of=/dev/null bs=8k count=10000
10000+0 records in
10000+0 records out
81920000 bytes transferred in 12.496958 secs (6555195 bytes/sec)
12.51s real 0.02s user 3.26s system
This is on
CPU: Pentium II/Xeon/Celeron (451.09-MHz 686-class CPU)
Origin = "GenuineIntel" Id = 0x652 Stepping = 2
ahc1: <Adaptec aic7895 Ultra SCSI adapter> irq 15 at device 20.1 on pci0
ahc1: aic7895 Wide Channel B, SCSI Id=7, 255 SCBs
da0 at ahc1 bus 0 target 0 lun 0
da0: <IBM DDRS-34560D DC1B> Fixed Direct Access SCSI-2 device
da0: 40.000MB/s transfers (20.000MHz, offset 8, 16bit), Tagged Queueing Enabled
da0: 4357MB (8925000 512 byte sectors: 255H 63S/T 555C)
So it doesn't look like a HW issue.
/Jesper
--
Jesper Skriver (JS4261-RIPE), Network manager
Tele Danmark DataNet, IP section (AS3292)
One Unix to rule them all, One Resolver to find them,
One IP to bring them all and in the zone to bind them.
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