On Fri, Dec 09, 2005 at 11:57:37AM -0000, Brent wrote:
> Hi
> Hope this is the right list I'm posting to but here goes.
>
> I recently upgraded 3 servers to the stock 2.6.14.3 kernels from an older
> 2.4.28 kernel, all identical running debian stable and all up to date with
> no outstandng updates needed to the OS.
> As from these 3 graphs (all servers almost identical hardware), PIII 900, 1G
> RAM, you can quite clearly see when the upgrades where made and sending the
> load avg up way above the previous averages.
> http://pics.skyblue.eu.org/graphs/
you graphs show a permanent load of 1 + something low. In the past, there
have been some bugs in modules which made them increase the apparent load
average by 1. I suspect that you're witnessing something similar here.
> All these servers are only running; shorewall, squid and ntop as their
> primary functions.
>
> Before I go pasting my .config etc etc I wanted to know first off what
> anyone would really like so I don't paste too much to create a really large
> post.
# ps aux
# lsmod
# dmesg
> Also if it's a known issue?
I don't think so. I've encountered scheduler fairness problems on 2.6
which always made me go back to 2.4, except for my home web server on
parisc which has never been stable for more than a few days on 2.4,
while it's rock solid on 2.6.11, but I never monitor performance there
so it's not a problem. Anyway, its loadavg is ~0.
> But here is a quick vmstat and as can see the 'in' is rather larger than
> normal I would think?
It's expected. In 2.6 on x86, you now have the system timer set to 250 Hz,
while it was at 100 on 2.4. So it implies 150 more interrupts/s that you
can count in the 'in' column. I guess you were roughly between 110 and 160
on 2.4 here.
> Top is not reporting anything usefull really.
>
> /usr/src/linux-2.6.14.3# vmstat -n 1
> procs -----------memory---------- ---swap-- -----io---- --system--
> ----cpu----
> r b swpd free buff cache si so bi bo in cs us sy id
> wa
> 0 0 0 26 231 364 0 0 0 13 13 4 1 2 97
> 0
> 0 0 0 26 231 364 0 0 0 0 272 42 0 0 100
> 0
> 0 0 0 26 231 364 0 0 0 0 265 35 0 0 100
> 0
> 0 0 0 26 231 364 0 0 0 0 276 46 0 0 100
> 0
> 0 0 0 26 231 364 0 0 0 36 290 70 0 0 100
> 0
> 0 0 0 26 231 364 0 0 0 48 276 64 0 0 100
> 0
> 0 0 0 26 231 364 0 0 0 0 291 69 0 0 100
> 0
> 0 0 0 26 231 364 0 0 0 12 266 37 0 0 100
> 0
> 0 0 0 26 231 364 0 0 0 0 315 120 0 0 100
> 0
> 0 0 0 26 231 364 0 0 0 4 322 116 0 0 100
> 0
> 0 0 0 26 231 364 0 0 0 0 313 99 0 0 100
> 0
> 0 0 0 26 231 364 0 0 0 0 301 92 0 0 100
> 0
> 0 0 0 26 231 364 0 0 0 0 279 49 0 0 100
> 0
> 0 0 0 26 231 364 0 0 0 0 298 77 0 0 100
> 0
> 0 0 0 26 231 364 0 0 0 0 315 93 0 0 100
> 0
> 0 0 0 26 231 364 0 0 0 36 300 74 0 0 100
> 0
> 0 0 0 26 231 364 0 0 0 0 283 45 0 0 100
> 0
>
> A list of the hardware is from lspci is:
>
> 0000:00:00.0 Host bridge: ServerWorks CNB20HE Host Bridge (rev 23)
> 0000:00:00.1 Host bridge: ServerWorks CNB20HE Host Bridge (rev 01)
> 0000:00:00.2 Host bridge: ServerWorks CNB20HE Host Bridge (rev 01)
> 0000:00:00.3 Host bridge: ServerWorks CNB20HE Host Bridge (rev 01)
> 0000:00:01.0 Ethernet controller: Intel Corp. 82557/8/9 [Ethernet Pro 100]
> (rev 08)
> 0000:00:02.0 Ethernet controller: Intel Corp. 82557/8/9 [Ethernet Pro 100]
> (rev 08)
> 0000:00:03.0 VGA compatible controller: ATI Technologies Inc Rage XL (rev
> 27)
> 0000:00:0f.0 ISA bridge: ServerWorks OSB4 South Bridge (rev 50)
> 0000:00:0f.1 IDE interface: ServerWorks OSB4 IDE Controller
> 0000:00:0f.2 USB Controller: ServerWorks OSB4/CSB5 OHCI USB Controller (rev
> 04)
> 0000:01:04.0 PCI bridge: Digital Equipment Corporation DECchip 21154 (rev
> 05)
> 0000:02:00.0 PCI bridge: Digital Equipment Corporation DECchip 21154 (rev
> 05)
> 0000:02:01.0 SCSI storage controller: QLogic Corp. ISP12160 Dual Channel
> Ultra3 SCSI Processor (rev 06)
> 0000:03:00.0 RAID bus controller: American Megatrends Inc. MegaRAID (rev 20)
> 0000:04:05.0 SCSI storage controller: Adaptec AIC-7899P U160/m (rev 01)
> 0000:04:05.1 SCSI storage controller: Adaptec AIC-7899P U160/m (rev 01)
> 0000:04:06.0 Ethernet controller: Intel Corp. 82546GB Gigabit Ethernet
> Controller (rev 03)
> 0000:04:06.1 Ethernet controller: Intel Corp. 82546GB Gigabit Ethernet
> Controller (rev 03)
Regards,
Willy
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