Your message dated Sun, 29 May 2016 21:24:52 +0100 with message-id [email protected] and subject line Closing bugs assigned to linux-2.6 package has caused the Debian Bug report #642729, regarding linux-image-2.6.32-5-686: bad ssd performance with squeeze kernel 2.6.32 to be marked as done.
This means that you claim that the problem has been dealt with. If this is not the case it is now your responsibility to reopen the Bug report if necessary, and/or fix the problem forthwith. (NB: If you are a system administrator and have no idea what this message is talking about, this may indicate a serious mail system misconfiguration somewhere. Please contact [email protected] immediately.) -- 642729: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=642729 Debian Bug Tracking System Contact [email protected] with problems
--- Begin Message ---Package: linux-image-2.6.32-5-686 Version: 2.6.32-35squeeze2jba Severity: normal After adding a ssd (OCZ Vertex Plus 60GB) to my squeeze system (debian kernel 2.6.32) I was disappointed about its performance, as it was advertised with 185 MB/s. /dev/sdb: Timing buffered disk reads: 214 MB in 3.01 seconds = 71.04 MB/sec However, when running recent knoppix (kernel 3.0.4) I got the expected performance: /dev/sdb: Timing buffered disk reads: 490 MB in 3.00 seconds = 163.07 MB/sec After googling, I found that this has been reported before: http://www.archivum.info/[email protected]/2010-02/00243/bad-performance-with-SSD-since-kernel-version-2.6.32.html It seems that early versions of kernel 2.6.32 have a bug that results in bad performance of some ssds (maybe all, at least the 'OCZ Vertex Plus 60GB' and the 'Super Talent Ultradrive GX MLC 64GB'). Reverting the patch as described in the discussion solved the problem for me. I now have the desired performance. Thus, I would suggest to revert the patch "block: improve queue_should_plug() by looking at IO depths" in kernel 2.6.32 for squeeze in order to get full ssd performance. I think the bugfix is important as an increasing number of users havs ssds and the bug more or less breaks ssd performance in squeeze. Juergen -- System Information: Debian Release: 6.0.2 APT prefers stable-updates APT policy: (500, 'stable-updates'), (500, 'stable') Architecture: i386 (i686) Kernel: Linux 2.6.32-5-686 (SMP w/2 CPU cores) Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Versions of packages linux-image-2.6.32-5-686 depends on: ii coreutils 8.5-1 GNU core utilities ii debconf [debconf-2.0] 1.5.36.1 Debian configuration management sy linux-image-2.6.32-5-686 recommends no packages. Versions of packages linux-image-2.6.32-5-686 suggests: pn fdutils <none> (no description available) pn ksymoops <none> (no description available) pn linux-doc-2.6.32-5-686 | linu <none> (no description available) pn linux-image-2.6.32-5-686-dbg <none> (no description available) -- debconf information: linux-image-2.6.32-5-686/preinst/failed-to-move-modules-2.6.32-5-686: linux-image-2.6.32-5-686/postinst/kimage-is-a-directory: linux-image-2.6.32-5-686/postinst/depmod-error-initrd-2.6.32-5-686: false linux-image-2.6.32-5-686/postinst/ignoring-do-bootloader-2.6.32-5-686: linux-image-2.6.32-5-686/postinst/old-system-map-link-2.6.32-5-686: true linux-image-2.6.32-5-686/postinst/missing-firmware-2.6.32-5-686: * linux-image-2.6.32-5-686/preinst/overwriting-modules-2.6.32-5-686: false linux-image-2.6.32-5-686/prerm/removing-running-kernel-2.6.32-5-686: true linux-image-2.6.32-5-686/postinst/depmod-error-2.6.32-5-686: false linux-image-2.6.32-5-686/postinst/old-dir-initrd-link-2.6.32-5-686: true linux-image-2.6.32-5-686/preinst/abort-overwrite-2.6.32-5-686: * linux-image-2.6.32-5-686/preinst/already-running-this-2.6.32-5-686:
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--- Begin Message ---Version: 3.4.1-1~experimental.1+rm Debian 6.0 Long Term Support has ended, and the 'linux-2.6' source package will no longer be updated. This bug was reassigned to the 'linux' source package earlier today, but I am now closing it on the assumption that it does not affect the kernel versions in newer Debian releases. If you can still reproduce this bug in a newer release, please reopen the bug report and reassign it to 'src:linux' and the affected version of the package. You can find the package version for the running kernel by running: uname -v or the versions of all installed kernel packages by running: dpkg -l 'linux-image-[34]*' | grep ^.i and looking at the third column. I apologise that we weren't able to provide a specific resolution for this bug. Ben. -- Ben Hutchings - Debian developer, member of Linux kernel and LTS teams
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