fedora 14 kernel performance with ip forwarding workload
by Jesse Brandeburg
The other day I was running the stock fedora kernel on my ip
forwarding setup, to see what the performance was, and the performance
wasn't very good.
system is S5520HC dual socket 2.93GHz Xeon 5570 (Nehalem) with 3 quad
port 82580 adapters (12 ports). Traffic is bidirectional 64 byte
packets being forwarded and received on each port, basically port to
port routing. I am only using 12 flows currently.
The driver is igb, and I am using an affinity script that lines up
each pair of ports that are forwarding traffic into optimal
configurations for cache locality. I am also disabling
remote_node_defrag_ratio to stop cross node traffic.
With the fedora default kernel from F14 it appears that
CONFIG_NETFILTER=y means that I cannot unload all of netfilter even if
I stop iptables service.
perf showed netfilter being prominent, and removing it gives me much
higher throughput. Is there a reason CONFIG_NETFILTER=y ? Isn't it a
good thing to be able to disable netfilter if you want to?
Jesse
7 years, 11 months
[PATCH] Drop the old Adaptec AIC7xxx driver
by Paul Bolle
Ever since v2.4.3 this driver is advertised as not being under active
development. It's main advantage to most users will be the warnings it
generates at build time:
drivers/scsi/aic7xxx_old.c: In function ‘aic7xxx_register’:
drivers/scsi/aic7xxx_old.c:7901:5: warning: case value ‘257’ not in enumerated type ‘ahc_chip’ [-Wswitch]
drivers/scsi/aic7xxx_old.c:7898:5: warning: case value ‘513’ not in enumerated type ‘ahc_chip’ [-Wswitch]
drivers/scsi/aic7xxx_old.c: In function ‘aic7xxx_load_seeprom’:
drivers/scsi/aic7xxx_old.c:8517:5: warning: case value ‘257’ not in enumerated type ‘ahc_chip’ [-Wswitch]
drivers/scsi/aic7xxx_old.c:8510:5: warning: case value ‘513’ not in enumerated type ‘ahc_chip’ [-Wswitch]
Let's drop this old driver.
Signed-off-by: Paul Bolle <pebolle(a)tiscali.nl>
---
0) I'm trying to get my kernel builds (which use the Fedora kernel
config) warning free. Upstream declined the brilliant fix to silence
these warnings (see https://lkml.org/lkml/2012/9/21/104 ).
1) Plan B is to simply drop this old driver in the Fedora kernel
altogether. That should silence these warnings too, shouldn't it? But is
dropping this old driver acceptable?
2) This patch is entirely untested.
config-generic | 1 -
1 file changed, 1 deletion(-)
diff --git a/config-generic b/config-generic
index 4a8015f..5cc8f8d 100644
--- a/config-generic
+++ b/config-generic
@@ -341,7 +341,6 @@ CONFIG_SCSI_3W_9XXX=m
CONFIG_SCSI_ACARD=m
CONFIG_SCSI_AACRAID=m
CONFIG_SCSI_AIC7XXX=m
-CONFIG_SCSI_AIC7XXX_OLD=m
CONFIG_AIC7XXX_CMDS_PER_DEVICE=4
CONFIG_AIC7XXX_RESET_DELAY_MS=15000
# CONFIG_AIC7XXX_BUILD_FIRMWARE is not set
--
1.7.11.7
10 years, 3 months
Re: [kernel] Disable debugging options.
by Thorsten Leemhuis
On 18.06.2012 15:09, Josh Boyer wrote:
> commit 3b37beedf48825354c42e25f7001677320958d38
> Author: Josh Boyer <jwboyer(a)redhat.com>
> Date: Mon Jun 18 09:09:58 2012 -0400
>
> Disable debugging options.
>
> config-generic | 8 ++--
> config-nodebug | 112 ++++++++++++++++++++++++++--------------------------
> config-x86-generic | 2 +-
> kernel.spec | 9 +++-
> 4 files changed, 67 insertions(+), 64 deletions(-)
> ---
> diff --git a/config-generic b/config-generic
> index 6b1c651..08c28ba 100644
> --- a/config-generic
> +++ b/config-generic
> @@ -1446,13 +1446,13 @@ CONFIG_B43_SDIO=y
> CONFIG_B43_BCMA=y
> # CONFIG_B43_BCMA_EXTRA is not set
> CONFIG_B43_BCMA_PIO=y
> -CONFIG_B43_DEBUG=y
> +# CONFIG_B43_DEBUG is not set
> [...]
Just out of curiosity: Why is enabling and disabling the debug options
done via "make {no,}debug" in the git checkout and not by an conditional
within the spec file? That afaics makes it harder to switch the debug
options off if you only have the SRPM at hand.
Or am I missing something obvious here?
CU
knurd
10 years, 6 months
why is memory hotplug disabled in f17+
by Roman Kagan
As I found out recently, memory hotplug is disabled in f17 and f18
kernels (but not in f16).
Can anybody please recall the reason for that?
The commit doing that is not particularly enlightening:
commit 2ee9f1482920f6d831eb6d70458bd0988394982b
Author: Dave Jones <davej(a)redhat.com>
Date: Fri Jan 13 17:33:51 2012 -0500
Disable memory hotplug on x86-64
I'd like to propose to re-enable it but I'm trying to figure out why
it was disabled in the first place.
Thanks,
Roman.
10 years, 6 months
Rawhide nodebug repo currently has a debug kernel
by Bruno Wolff III
3.7.0-0.rc6.git1.1.fc19 in the rawhide nodebug repo looks to be a debug
kernel based on the rpms in that repo. (It also appears to have the
performance issues of a debug kernel.)
10 years, 6 months
Fedora Kernel Meeting Minutes for Nov 16, 2012
by Josh Boyer
The minutes below are fairly sparse in content. The meeting itself was
very brief, so feel free to look in the full logs. A summary on F18
beta is "we're in fairly decent shape. Testing and karma for the
kernels in updates-testing are always appreciated."
==============================
#fedora-meeting: Fedora Kernel
==============================
Meeting started by jwb at 19:00:03 UTC. The full logs are available at
http://meetbot.fedoraproject.org/fedora-meeting/2012-11-16/fedora-meeting...
.
Meeting summary
---------------
* init (jwb, 19:00:19)
* F18 beta status (jwb, 19:02:10)
* open floor (jwb, 19:10:56)
* LINK: http://paste.stg.fedoraproject.org/1794/ (nirik, 19:31:07)
Meeting ended at 19:35:50 UTC.
Action Items
------------
Action Items, by person
-----------------------
* **UNASSIGNED**
* (none)
People Present (lines said)
---------------------------
* jwb (56)
* jforbes (21)
* brunowolff (9)
* nirik (9)
* zodbot (2)
Generated by `MeetBot`_ 0.1.4
.. _`MeetBot`: http://wiki.debian.org/MeetBot
10 years, 6 months
nodebug repo feedback
by Bruno Wolff III
Observations:
Not having it obvious in the kernel name that it was a kernel from the
nodebug repo caused a minor amount of confusion.
A normal rawhide kernel and a nodebug repo kernel both ended up with the
name 3.7.0-0.rc5.git1.3.fc19.
A normal rawhide nodebug kernel is still being built once per rc.
There seems to be a lot of variability in the lag of when a nodebug version
of any particular rawhide kernel.
Suggestions:
Instead of bumping the release number for nodebug kernels and the string
".nodebug" to the end of the release. For example:
3.7.0-0.rc5.git1.3.fc19.nodebug
Always build debug kernels for rawhide.
Automate building of nodebug kernels so that once a rawhide kernel has
successfully completed building in koji, the same kernel gets rebuilt
as a nodebug kernel. Check on the order of hourly.
10 years, 6 months
Hi from ARM
by Peter Robinson
I'm been bothering Josh and others long enough with breaking kernel
builds with the ARM bits that I should probably be subscribed to the
list now that I know there is one!
Have a good weekend
Peter
10 years, 6 months
[PATCH] KConfig: enable CONFIG_CIFS_SMB2
by Jeff Layton
Enough of the CIFS SMB2 code has been merged into 3.7 that users can
now mount SMB2.1 shares from servers that support it. It's still fairly
experimental, but enabling the Kconfig option is unlikely to break
users who are using SMB1.
Let's go ahead and enable this in 3.7 kernels. I think this patch
should be sufficient, but let me know if we should do anything else.
Signed-off-by: Jeff Layton <jlayton(a)redhat.com>
---
config-generic | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/config-generic b/config-generic
index 1ac3545..a27aedd 100644
--- a/config-generic
+++ b/config-generic
@@ -3671,7 +3671,7 @@ CONFIG_RPCSEC_GSS_KRB5=m
CONFIG_CIFS=m
CONFIG_CIFS_STATS=y
# CONFIG_CIFS_STATS2 is not set
-# CONFIG_CIFS_SMB2 is not set
+CONFIG_CIFS_SMB2=y
CONFIG_CIFS_UPCALL=y
CONFIG_CIFS_XATTR=y
CONFIG_CIFS_POSIX=y
--
1.7.11.7
10 years, 6 months
Unknown module key warnings
by Bruno Wolff III
As far as I can tell the unknown module key isn't a problem, but I get a number
of warnings for it during boot. Is there really a problem here? If there
isn't, can these be suppressed?
Here is an example warning:
Nov 12 00:03:43 bruno kernel: [ 40.835401] Request for unknown module key 'Fedora kernel signing key: 2f230f4662d4290a932538bd964f802eaa42f49a' err -11
10 years, 6 months
