Your message dated Wed, 13 Dec 2006 10:59:03 +0000
with message-id <[EMAIL PROTECTED]>
and subject line Bug#402860: hdparm: 'cached reads' performance twice as fast
in ubuntu !?
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--- Begin Message ---
Package: hdparm
Version: 6.9-1
Severity: normal
Hi,
This is the output of hdparm -tT /dev/sda:
Timing cached reads: 1640 MB in 2.00 seconds = 820.03 MB/sec
Timing buffered disk reads: 114 MB in 3.05 seconds = 37.43 MB/sec
The 'buffered disk reads' performance is ok (100GB 2.5" disk) but the
'cached reads' performance is too slow (Pentium M 750 1.86 Ghz). Using
the (K)ubuntu live-cd I get +- 1650 MB/sec.
I tried this on 3 different laptops. Any ideas what the reason might be
?
Regards,
Serge
-- System Information:
Debian Release: 4.0
APT prefers unstable
APT policy: (500, 'unstable')
Architecture: i386 (i686)
Shell: /bin/sh linked to /bin/bash
Kernel: Linux 2.6.18-3-686
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Versions of packages hdparm depends on:
ii libc6 2.3.6.ds1-9 GNU C Library: Shared libraries
ii lsb-base 3.1-22 Linux Standard Base 3.1 init scrip
hdparm recommends no packages.
-- no debconf information
--- End Message ---
--- Begin Message ---
This one time, at band camp, Serge Koganovitsch said:
> This is the output of hdparm -tT /dev/sda:
>
> Timing cached reads: 1640 MB in 2.00 seconds = 820.03 MB/sec
> Timing buffered disk reads: 114 MB in 3.05 seconds = 37.43 MB/sec
>
> The 'buffered disk reads' performance is ok (100GB 2.5" disk) but the
> 'cached reads' performance is too slow (Pentium M 750 1.86 Ghz). Using
> the (K)ubuntu live-cd I get +- 1650 MB/sec.
>
> I tried this on 3 different laptops. Any ideas what the reason might be ?
Yes. From the Changelog:
- fix X2 over-reporting of -T results
So Kubuntu is 'too fast', unfortunately.
Take care,
--
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