hdparm -T 2 times slower on F7t4

[Doncho N. Gunchev]

Is someone else seeing this?

F7t4# hdparm -tT /dev/sda

/dev/sda:
 Timing cached reads:   2206 MB in  2.00 seconds = 1104.24 MB/sec
 Timing buffered disk reads:  102 MB in  3.03 seconds =  33.68 MB/sec

FC6# hdparm -tT /dev/hda

/dev/hda:
 Timing cached reads:   4576 MB in  2.00 seconds = 2290.99 MB/sec
 Timing buffered disk reads:  102 MB in  3.01 seconds =  33.86 MB/sec

Is this a real problem?

[drago01]

On 5/3/07, Doncho N. Gunchev  wrote:
> Is someone else seeing this?
>
> F7t4# hdparm -tT /dev/sda
>
> /dev/sda:
> Timing cached reads:   2206 MB in  2.00 seconds = 1104.24 MB/sec
> Timing buffered disk reads:  102 MB in  3.03 seconds =  33.68 MB/sec
>
> FC6# hdparm -tT /dev/hda
>
> /dev/hda:
> Timing cached reads:   4576 MB in  2.00 seconds = 2290.99 MB/sec
> Timing buffered disk reads:  102 MB in  3.01 seconds =  33.86 MB/sec
>
> Is this a real problem?

the kernel has debug features enabled (see test4 release notes) they could
be the reason for this.

[Doncho N. Gunchev]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On Thursday 2007-05-03 13:44:18 dragoran dragoran wrote:
> On 5/3/07, Doncho N. Gunchev  wrote:
> > Is someone else seeing this?
> >
> > F7t4# hdparm -tT /dev/sda
> >
> > /dev/sda:
> > Timing cached reads:   2206 MB in  2.00 seconds = 1104.24 MB/sec
> > Timing buffered disk reads:  102 MB in  3.03 seconds =  33.68 MB/sec
> >
> > FC6# hdparm -tT /dev/hda
> >
> > /dev/hda:
> > Timing cached reads:   4576 MB in  2.00 seconds = 2290.99 MB/sec
> > Timing buffered disk reads:  102 MB in  3.01 seconds =  33.86 MB/sec
> >
> > Is this a real problem?
>
> the kernel has debug features enabled (see test4 release notes) they could
> be the reason for this.

Hm, still the same situation with F7 final...

- -- 
Regards,
  Doncho N. Gunchev, GPG key ID: 0EF40B9E, Key server: pgp.mit.edu
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[Dave Jones]

On Fri, Jun 01, 2007 at 08:25:16PM +0300, Doncho N. Gunchev wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> On Thursday 2007-05-03 13:44:18 dragoran dragoran wrote:
> > On 5/3/07, Doncho N. Gunchev  wrote:
> > > Is someone else seeing this?
> > >
> > > F7t4# hdparm -tT /dev/sda
> > >
> > > /dev/sda:
> > > Timing cached reads:   2206 MB in  2.00 seconds = 1104.24 MB/sec
> > > Timing buffered disk reads:  102 MB in  3.03 seconds =  33.68 MB/sec
> > >
> > > FC6# hdparm -tT /dev/hda
> > >
> > > /dev/hda:
> > > Timing cached reads:   4576 MB in  2.00 seconds = 2290.99 MB/sec
> > > Timing buffered disk reads:  102 MB in  3.01 seconds =  33.86 MB/sec
> > >
> > > Is this a real problem?
> >
> > the kernel has debug features enabled (see test4 release notes) they could
> > be the reason for this.
>
> Hm, still the same situation with F7 final...

file a bug, attaching the output of dmesg (from both if possible)
and lspci output.

thanks,

Dave

[Ronald Warsow]

Dave Jones wrote:
> On Fri, Jun 01, 2007 at 08:25:16PM +0300, Doncho N. Gunchev wrote:
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1
> >
> > On Thursday 2007-05-03 13:44:18 dragoran dragoran wrote:
> > > On 5/3/07, Doncho N. Gunchev  wrote:
> > > > Is someone else seeing this?
> > > >
> > > > F7t4# hdparm -tT /dev/sda
> > > >
> > > > /dev/sda:
> > > > Timing cached reads:   2206 MB in  2.00 seconds = 1104.24 MB/sec
> > > > Timing buffered disk reads:  102 MB in  3.03 seconds =  33.68 MB/sec
> > > >
> > > > FC6# hdparm -tT /dev/hda
> > > >
> > > > /dev/hda:
> > > > Timing cached reads:   4576 MB in  2.00 seconds = 2290.99 MB/sec
> > > > Timing buffered disk reads:  102 MB in  3.01 seconds =  33.86 MB/sec
> > > >
> > > > Is this a real problem?
> > >
> > > the kernel has debug features enabled (see test4 release notes) they could
> > > be the reason for this.
> >
> > Hm, still the same situation with F7 final...
>
> file a bug, attaching the output of dmesg (from both if possible)
> and lspci output.
>
> thanks,
>
> Dave

... and please broadcast the bug id

[Doncho N. Gunchev]

On Friday 2007-06-01 21:56:14 Dave Jones wrote:
> On Fri, Jun 01, 2007 at 08:25:16PM +0300, Doncho N. Gunchev wrote:
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1
> >
> > On Thursday 2007-05-03 13:44:18 dragoran dragoran wrote:
> > > On 5/3/07, Doncho N. Gunchev  wrote:
> > > > Is someone else seeing this?
> > > >
> > > > F7t4# hdparm -tT /dev/sda
> > > >
> > > > /dev/sda:
> > > > Timing cached reads:   2206 MB in  2.00 seconds = 1104.24 MB/sec
> > > > Timing buffered disk reads:  102 MB in  3.03 seconds =  33.68 MB/sec
> > > >
> > > > FC6# hdparm -tT /dev/hda
> > > >
> > > > /dev/hda:
> > > > Timing cached reads:   4576 MB in  2.00 seconds = 2290.99 MB/sec
> > > > Timing buffered disk reads:  102 MB in  3.01 seconds =  33.86 MB/sec
> > > >
> > > > Is this a real problem?
> > >
> > > the kernel has debug features enabled (see test4 release notes) they could
> > > be the reason for this.
> >
> > Hm, still the same situation with F7 final...
>
> file a bug, attaching the output of dmesg (from both if possible)
> and lspci output.
>
> thanks,
>
> Dave

Bug # 242123 ( https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=242123 )
I will have both FC6 and F7 on the PC just in case for the next 2-3 months.