RE: Question on unmapping of PCIe mapped regions

Thanks for your suggestions. The unmapping of the packet buffers is done only after the buffer has been completely transmitted or received. This is known by examining the completion information from the buffer descriptor. So, the possibility of the DMA happening while/after unmapping of buffers is

Re: Question on unmapping of PCIe mapped regions

Hi.. On Feb 13, 2008 10:07 PM, Priya Suryanarayanan <[EMAIL PROTECTED]> wrote: > > > > > I own a Gigabit Ethernet driver which is being tested on a PCI Express PC > running Linux 2.6.18.1. > > > > For normal traffic (ping, ftp, telnet, WWW), there seems to be no problem. > When regression-testin

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uart_console_write()

I was recently hacking on one of my drivers which was reporting that its hardware experienced a FIFO overflow. To me this was a symptom that interrupt latency was exceptionally high. Not long afterwards, I found myself in uart_console_write() inside a spinlock (with interrupts disabled), with

Re: memcpy in userspace?

Hi Martin, Thanks for the response! you can only use memcpy if you have the source and destination physical address. If you don´t know them, you can use access_process_vm to copy from the process A to a kernel buffer, and finally from this kernel buffer to process B address space.

Re: memcpy in userspace?

On 2/13/08, Anant Narayanan <[EMAIL PROTECTED]> wrote: > Hi, > > As a followup to my previous post, my problem would be solved if there > is some way of copying data from a userspace virtual memory location > to another userspace location. > > I've seen a function called copy_in_user(), but that h

memcpy in userspace?

Hi, As a followup to my previous post, my problem would be solved if there is some way of copying data from a userspace virtual memory location to another userspace location. I've seen a function called copy_in_user(), but that hasn't been implemented for x86 (only for x86-64, arm and mip

Question on unmapping of PCIe mapped regions

I own a Gigabit Ethernet driver which is being tested on a PCI Express PC running Linux 2.6.18.1. For normal traffic (ping, ftp, telnet, WWW), there seems to be no problem. When regression-testing with netperf, the system hangs randomly. After a lot of debugging, I've discovered that this event

Linux kernel 2.4.21-47 security exploit & venerability list

Hi All, Can someone point me to some link where I can find the kernel 2.4.21-47security exploit & venerability list. Thanks, Devendra

Re: unclean root file-system after shutting down from single-user-mode

> The problem comes when stopping the system. > The only way to do it is by pressing CTRL+ALT+DEL as CTRL+C does not > work in that mode. > Unfortunately, by using CTRL+ALT+DEL combination, Linux kernel does > the unclean unmounting of root filesystem. > This causes the file-system check on next bo

Re: unclean root file-system after shutting down from single-user-mode

Hi, On Feb 13, 2008 12:23 PM, Pravin <[EMAIL PROTECTED]> wrote: > Hi, > > I need to run single application on a linux kernel so that I can get > better performance. > For that I used "init=/my_application" as kernel parameter > This made sure that kernel will run only this application. > As there

unclean root file-system after shutting down from single-user-mode

Hi, I need to run single application on a linux kernel so that I can get better performance. For that I used "init=/my_application" as kernel parameter This made sure that kernel will run only this application. As there are no other processes, my application gets most of the resources, and hence I

Re: Documentation about sysfs/procfs entries

Hi... On Feb 13, 2008 11:43 AM, Randy Dunlap <[EMAIL PROTECTED]> wrote: > Any doc additions or improvements would be appreciated. > I'll be glad to help get them merged... You can see my post here: http://lkml.org/lkml/2008/1/26/100 Let me know if the patch format is still wrong or anything that

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Re: Documentation about sysfs/procfs entries

On Wed, Feb 13, 2008 at 03:40:32PM +0800, Peter Teoh wrote: > some questions: > > a. the list of parameters can presumably be extracted from existing > file via "procname" search.not sure if it is correct (as per > attached, complete?) I don't see anything attached :( > b. what is the di