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rommel
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PostPosted: Sun Jun 16, 2002 10:51 pm    Post subject: gentoo sources? Reply with quote

i just rebuilt the kernel i had been running and i used the latest gentoo sources....my lsr lost like 15mb/s...its down to 68mb/s from the tranfer rates i was getting when i was running the vanilla kernel...whats the benefit of the gentoo kernel?...am i not configuring something right?

ciao
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delta407
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PostPosted: Mon Jun 17, 2002 2:40 am    Post subject: Reply with quote

The Gentoo kernel is a heavily patched kernel prepatch (i.e. a pre-lease of 2.4.19); it is often a lot less stable, though in many cases faster.
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rommel
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PostPosted: Mon Jun 17, 2002 6:27 am    Post subject: Reply with quote

well i just went back to the vanilla kernel and my hdparm reads went right back up....just think its strange...i am using lsr raid 0 on a resierfs / partition...then i was setting up another system with an lsi scsi host adapter using a sym53c1010 chip...and scsi cheetah drives....they were scoring less then ide drives....havent tried them with the vanilla kernel yet though...possibly it could be similar but i am not sure why they would be performing like ata drives when their seek time is like 3.6ms and they run at 15k

Last edited by rommel on Mon Jun 17, 2002 7:12 am; edited 1 time in total
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DArtagnan
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PostPosted: Mon Jun 17, 2002 6:36 am    Post subject: Reply with quote

delta407 wrote:
The Gentoo kernel is a heavily patched kernel prepatch (i.e. a pre-lease of 2.4.19); it is often a lot less stable, though in many cases faster.


So you wanna say that vanilla is more stable and better than gentoo?
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PostPosted: Tue Jun 18, 2002 5:59 am    Post subject: Reply with quote

pacman wrote:
delta407 wrote:
The Gentoo kernel is a heavily patched kernel prepatch (i.e. a pre-lease of 2.4.19); it is often a lot less stable, though in many cases faster.


So you wanna say that vanilla is more stable and better than gentoo?

Yes pacman vanilla is more stable, but I haven't had any issues with gentoo-sources other than the xfs/preempt and this is not gentoo specific.
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delta407
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PostPosted: Tue Jun 18, 2002 6:09 am    Post subject: Reply with quote

Well, of course it's not Gentoo-specific, but they are still issues. I'm running a gentoo-sources kernel right now, actually -- nothing has blown up on me yet, and I'm willing to babysit this computer in case something does. But, in a production environment (or anything else where it has to work, or else) I would not run anything other than a vanilla kernel.

Kernel releases get tested, Gentoo kernels don't (except for a couple developers and the Gentoo users as guinea pigs). vanilla-sources is a lot more conservative than gentoo-sources (read README.gentoo and see what you're getting first).

Behold, the beauty of *nix: the choice is yours.
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PostPosted: Tue Jun 18, 2002 11:28 pm    Post subject: Reply with quote

I wouldn't really refer to myself as a "guinea pig" :roll:
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c_kuzmanic
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PostPosted: Tue Jun 18, 2002 11:40 pm    Post subject: Reply with quote

Hmm, I think the term "Heavily patched Kernel" is a relative term, especially when applied to gentoo-sources. All the patches are listed in the gentoo-sources ebuild file, compared to red hat or mandrake kernels the patches are rather modest and few in number.
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delta407
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PostPosted: Tue Jun 18, 2002 11:58 pm    Post subject: Reply with quote

Diff it to 2.4.18 and you get... wait, let's see:

Code:
# ls -l linux-gentoo-2.4.19-gentoo-r7.patch.bz2
-rw-r--r--    1 root     root      6423812 Jun  6 22:00 linux-gentoo-2.4.19-gentoo-r7.patch.bz2


6.4 MB of patches bzip2'ed, which comes out to a 39 MB diff decompressed.

That's not heavily patched?
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c_kuzmanic
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PostPosted: Wed Jun 19, 2002 12:16 am    Post subject: Reply with quote

From the gentoo-sources ebuild file:

#What's in this kernel?

#INCLUDED:
# from http://www.kernel.org (ac):
# 2.4.19-pre7-ac2
# removed the software suspend patch; it can be dangerous and
# conflicts with the new ACPI
# from http://oss.sgi.com/projects/xfs:
# SGI XFS 1.1 (Official release code -- the most thoroughly tested)
# from http://www.grsecurity.org:
# grsecurity-1.9.4 (with 2 updates/fixes and a fix for an NVIDIA driver compile problem)
# from http://www.zipworld.com.au/~akpm/linux/schedlat.html:
# 2.4.19-pre7-low-latency
# from http://luxik.cdi.cz/~devik/qos/htb/:
# htb2 (QoS support)
# from http://www.tech9.net/rml/linux:
# preempt-kernel-rml-2.4.19-pre7-ac2-1.patch
# preempt-stats-rml-2.4.19-pre5-ac3-1.patch
# from http://www.infolinux.de/jp10:
# 40_TIOCGDEV.bz2
# 51_loop-jari-2.4.16.0.bz2
# 98_tkparse-4096.bz2
# from http://www.kernel.org (aa):
# 00_3.5G-address-space-4
# from http://www.sourceforge.net/projects/acpi:
# acpi-20020503-2.4.18.diff.gz
# (This allows booting of Toshiba Satellite 5005-S507 "legacy free" laptops)
# Added tweak so that CONFIG_PM is defined only if CONFIG_ACPI or CONFIG_APM is also
# set. Removed CONFIG_PM toggle from configuration.
# from http://www.infolinux.de/jp13:
# 07_jiffies-for-i386 (tweaked so that 1000HZ is the default for x86)
# 54_mmx-init
# 55_p4-xeon
# 56_x86-fast-pte
# 58_acpi-lowerlatency-3
# 59_acpi-pciirq-18
# 60_acpi-y2k-1
# from Blue Lizard <webmaster at dofty.zzn.com>:
# A 2-line patch to enable compatibility with the new SiS 740/961 Athlon chipset
# from http://www.sourceforge.net/projects/evms:
# IBM Enterprise Volume Management System version 1.0.1
# from linux-2.4.18-wolk3.4-rc5-patchset (http://www.sourceforge.net/projects/wolk):
# 102_amd_lvcool.diff
# Allows slightly cooler running AMD Athlon CPUs in systems with VIA mobos
# Additional fixes:
# Marked ACPI option as "DANGEROUS" (because it is and can cause boot ooopses --
# use it only if you need it)
# Marked JFS filesystem option as "FOR TESTING ONLY" (current JFS code seems to
# have super-bad peformance and easily triggerable locks)
# from mjc's collection of patches:
# vfat symlink patch. Creating symlinks on vfat creates Windowsy .lnk files.
# CDDA dma patch -- enables DMA for CD devices#

No sorry, I don't not consider that a heavily patched kernel, and keep in mind that I am comparing it to a red hat or mandrake kernel. I'll say it again, compared to those kernels, gentoo-sources patches are few in number and moreover, their very economical and efficient. The only gentoo patch I ever had problems with was the low-latency patch and those problems would only manifest when I used low-latency and the pre-emptive kernel patches in conjunction. Also, the number of patches applied to a kernel says nothing about the quality/performance of that kernel, and from that perspective gentoo gets full marks.
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delta407
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PostPosted: Wed Jun 19, 2002 12:31 am    Post subject: Reply with quote

I don't disagree. Redhat and Mandrake do apply more patches, but they are tested on a very wide range of hardware. gentoo-sources is not. I, for one, am currently running gentoo-sources. An earlier revision was giving me some trouble, so I went to vanilla-sources; but the current one seems stable enough.

Nonetheless, I maintain my stance that gentoo-sources has caused many problems that do not exist with vanilla-sources. Kernel prepatches are historically less stable than kernel releases, and gentoo-sources (as a prepatch) inherits this reputation.
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c_kuzmanic
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PostPosted: Wed Jun 19, 2002 12:38 am    Post subject: Reply with quote

delta407 wrote:

Nonetheless, I maintain my stance that gentoo-sources has caused many problems that do not exist with vanilla-sources. Kernel prepatches are historically less stable than kernel releases, and gentoo-sources (as a prepatch) inherits this reputation.


Yep, that's true, the forum is full of problem reports that can be traced down to kernel-patches not performing properly, especially hardware related issues.
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