July 2011 - kernelnewbies@kernelnewbies.org - Kernelnewbies Mailing Lists

emneded ftp server which support IPV6
by Gang Lei (雷刚) Aug. 1, 2011

Aug. 1, 2011

Hello all: Could you please list any embedded ftp server which can support IPV6 nowadays? The image size should be less than 1M and it can run in standalone mode, I need such a server running on my arm926ej-s board. Thanks for your help in advance! Rui

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Fw: Question about interrupts
by manish honap July 30, 2011

July 30, 2011

Well 2.6.39 seems to have changed and the flow as I understand for interrupt processing is do_IRQ -> irq_enter -> handle_irq -> ... but in above flow i cant find local_irq_enable anywhere; is there some different trick used to enable the interrupts ? ----- Forwarded Message ---- From: santhosh kumars <karuna.linux(a)gmail.com> To: manish honap <manish_honap_vit(a)yahoo.co.in> Cc: kernelnewbies(a)kernelnewbies.org Sent: Fri, 29 July, 2011 3:31:10 PM Subject: Re: Question about interrupts On Fri, Jul 29, 2011 at 3:16 PM, manish honap <manish_honap_vit(a)yahoo.co.in> wrote: > Hello all, > > When interrupts are handled through interrupt gate cpu automatically clears IF > flag. > > but to allow nesting kernel sets the IF flag in handle_irq_event - for 2.6.11 > > but in 2.6.39 how the interrupts are re-enabled so as to facilitate nesting of > interrupts > I am unable to find local_irq_enable in do_IRQ() I think in handle_IRQ_event event again interrupts are enabled if (!(action->flags & IRQF_DISABLED)) local_irq_enable_in_hardirq(); > > Thanks in advance. > > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies(a)kernelnewbies.org > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies >

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How to get cpu utilization through code with least overhead?
by Vaibhav Jain July 30, 2011

July 30, 2011

Hi, I need to write code to get and record the cpu utilization in certain interval with the least overhead. Could anybody please advise me on how to proceed ? I tried looking at the code for "top" command to see how it works but couldn't figure out much. I don't want to write script that uses commands and pulls out the results as I want the overhead to be as small as possible. Thanks Vaibhav Jain

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No printk to inform how much memory freed in ARM after booting
by anish singh July 30, 2011

July 30, 2011

Guess, this is trivial question but probably useful to know. void free_initmem(void) { #ifdef CONFIG_HAVE_TCM extern char __tcm_start, __tcm_end; totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)), __phys_to_pfn(__pa(&__tcm_end)), "TCM link"); #endif #ifndef CONFIG_HOTPLUG_CPU if (!machine_is_integrator() && !machine_is_cintegrator()) totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)), __phys_to_pfn(__pa(__init_end)), "init"); #endif } Here i don't see any printk information for specifying how much memory is freed. Other architectures do have this printk e.g kernel/arch/ia64/mm/init.c +169 While checking this excellent answer[1] given by rene i found that arm is missing this or may be i am missing something probably this information i can find it somewhere else also. Intention was to add __devinit in my probe function and out of curiosity how much i am saving. [1]http://www.spinics.net/lists/newbies/msg29197.html

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Regarding connector netlink running out of buffer space.
by mindentropy July 29, 2011

July 29, 2011

Hi, I am trying to benchmark connector netlink and am passing a file and sending the same to listening userspace app's using connectors i.e. cat filename > /dev/myconnector and an app listening. When I do this I always run into ENOBUFS or "No buffer space available" for files greater than 2MB. Now how should I fix this? a) Increase the socket buffers? My rmem_max is 131071 and rmem_default is 126976 b) Should I check for the seq and ack and resend the packets? If yes how much packets should I not discard to do a resend? Are there any other ways? Also I am not sure why local loop would cause enobufs? I am running this on a quad core with 3G of RAM. Thanks.

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How can install gcc-3.2.tar.bz
by esmaeil mirzaee July 29, 2011

July 29, 2011

Apologize in advanced for interrupt and weak English. Let me ask a question in lazy way. I wanna install gcc-3.2.tar.bz then I download from ftp://ftp.mirrorservice.org/sites/sourceware.org/pub/gcc/releases/gcc-3.2/ Could you help me. Best Samuel

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Re: How can patch a bug
by esmaeil mirzaee July 29, 2011

July 29, 2011

Hi On Fri, Jul 29, 2011 at 2:56 PM, Ian Lance Taylor <iant(a)google.com> wrote: > esmaeil mirzaee <esmaeil.debian(a)gmail.com> writes: > >> I try to install gcc-3.4.6 I've search the Internet(Thank you google). >> I found it was a bug and a best man did a patch and now I want to run >> that patch to resolved the problem. > > Run the patch program. > > "man patch" I wanna run this patch http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19985 for resolve my problem. What patch I must to download. I need them for gcc-3.4.6 > > Ian >

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How can patch a bug
by esmaeil mirzaee July 29, 2011

July 29, 2011

Hi apologize in advance, for my interrupt. I try to install gcc-3.4.6 I've search the Internet(Thank you google). I found it was a bug and a best man did a patch and now I want to run that patch to resolved the problem. If anyone can help I can be very glad. again thank you for your effort Best samuel IRC:ronin___

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about gcc-3.4.6
by esmaeil mirzaee July 29, 2011

July 29, 2011

Hi all apologize in advance, I know here is related the kernel but my question is how can install gcc-3.4.6, I looked around but I could not find anything useful. I need gcc-3.4.6 for do work with ubuntu kernel and install some stuff I needed. Again I'm so sorry for interrupt. Best Samuel

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Query regarding dma_alloc()
by sandeep kumar July 29, 2011

July 29, 2011

Hi all, What is the difference between the following memory allocations. 1) Memory allocation by doing, char *buf; buf = kmalloc(BUF_LEN, *GFP_DMA* | GFP_KERNEL); 2) And by char *buf; buf = dma_alloc(...); in the link http://www.arm.linux.org.uk/developer/memory.txt it says that dma_alloc() returns virtual address in "ffc00000-----fffeffff" this region, while in the first case it is returning Virtual address in "low-memory" region. For DMA mappable memory which one we should use..? -- With regards, Sandeep Kumar Anantapalli,

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