broadcast arp messages and linux kernel

Hello, Recently I have detected an IP conflict while my OS is redhat. Searching for a solution revealed that linux kernel doesn't reply to broadcast arp messages *at all*. As a result when someone asks "who has ip A.B.C.D?", my kernel won't reply to that and the other host thinks no one has th

Using perf on AMD 15h

Hi Guys, My first question is, does the version of kernel affects the perf functionality? I mean fixing bugs and ... Currently, the kernel version is 2.6.39 and here is the problem: According tot he BKDG of AMD 15h, it is possbile to disable the hardware prefetcher by setting some bits of MSRC001_

Re: Using perf on AMD 15h

Bringing up my question one more time since it may be lost in the high volume of messages. Hope to receive an idea... On 6/6/15, Mahmood Naderan wrote: > Hi Guys, > My first question is, does the version of kernel affects the perf > functionality? I mean fixing bugs and ... > Cu

Perf doesn't show build-id of the application itself

When I run the following perf command for collecting user data $ perf record -e cycles:u -j any,u -a -o perf.data.user ./test The output of build-id checking is $ perf buildid-list -f -i perf.data.user dbd41c586ea6789f3b998ed28be6ff37134e917a /lib/modules/4.19.125/build/vmlinux b5381a457906d2790

Thread Scheduler

Hi Maybe this is a noob question... Where in the linux kernel source (2.6), the thread scheduler has been implemented? Searching the web shows that there should sched_fair.c but I can not find that in the source directory (the kernel source has been installed). Basically, I want to know

Re: Thread Scheduler

>On Wednesday, March 19, 2014 3:57 PM, Mike Galbraith > wrote: >On Wed, 2014-03-19 at 02:57 -0700, Mahmood Naderan wrote: >> >> Hi >> Maybe this is a noob question... >> Where in the linux kernel source (2.6), the >> >> thread scheduler ha

Re: Thread Scheduler

On Wednesday, March 19, 2014 4:36 PM, Jack Carrozzo wrote: >On Wed, Mar 19, 2014 at 7:34 AM, Mahmood Naderan wrote: > >> >> [...] >> Do you mean include/linux/sched.h ? >> Where is he implementation then? > >Your kernel source is incomplete. You can fetch

Re: Thread Scheduler

>On Thursday, March 20, 2014 6:53 AM, Mike Galbraith >wrote: > >marge:~ # man -k setscheduler getscheduler >sched_setscheduler (2) - set and get scheduling policy/parameters >sched_setscheduler (3p) - set scheduling policy and parameters (REALTIME) >sched_getscheduler (2) - set and get sche

Re: Thread Scheduler

On Sunday, March 23, 2014 6:35 PM, Mark Knecht wrote: >In terms of changing the scheduler I think that you possibly missed >reading Documentation/block/switching-sched.txt in the kernel's >documentation directory. > >HTH, >Mark That is IO scheduler. Can we use the same for threads/processes?

CPU usage limitation (number of cores)

Hi, There is a question about CPU usage limitation and I found no place for my question other than here. There are 32 cores in a system (2 cpus each 16 cores) and I want to limit a user to use only 4 cores (100% usage for that 4 cores). There are two kernel parameter for that according to the manu

Re: CPU usage limitation (number of cores)

Try #1 to bring the post up again. Due to the traffic, maybe my question is ignored :( Regards, Mahmood On Tue, Mar 22, 2016 at 1:09 PM, Mahmood Naderan wrote: > Hi, > There is a question about CPU usage limitation and I found no place > for my question other than here. > &g

Question regarding brstack

Hello I used "brstack" in the perf command and see the following entries 0xb220bda7/0xb2209890/P/-/-/0 0x40053a/0x400530/P/-/-/0 The first and seconds are said to be the branch instruction and target addresses. However, it is not written in the manual if that is a virtual or phys

Using a custom LDFLAG for all objects and binaries

Hi I would like to modify the kernel makefile in a way to include --emit-relocs for every file that is linked during the process of kernel make. I see KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) LDFLAGS_MODULE = LDFLAGS_vmlinux = ... But I don't know which one is the main. Should I

Re: Using a custom LDFLAG for all objects and binaries

> Have you read Documentation/kbuild/makefiles.rst ? > > LDFLAGS > Generic $(LD) options > > Flags used for all invocations of the linker. What I see is this in Documentation/kbuild/makefiles.txt LDFLAGS Generic $(LD) options Flags used for all invoca

Re: Using a custom LDFLAG for all objects and binaries

> > or > > 2- Editing arch/x86/Makefile with > >KBUILD_LDFLAGS := -m --emit-relocs elf_$(UTS_MACHINE) > > That should work. Seems not... I ran the following commands: $ cp -v /boot/config-$(uname -r) .config $ make menuconfig -> Exit -> Save $ vim arch/x86/Makefile KBUILD_LDFLAGS := -m

Re: Using a custom LDFLAG for all objects and binaries

>OK, I suggest that you reorder the options like so: > >KBUILD_LDFLAGS := -m elf_$(UTS_MACHINE) --emit-relocs I did that. After $ make V=1 $ sudo make modules_install V=1 $ sudo make install I grepped for "emit-relocs" in the log and saw many instances such as gcc -Wp,-MD,drivers/rtc