Re: Eudyptula Challenge Task 01

2014-06-19 Thread sanjeev sharma
There may be chance that http://lxr.free-electrons.com/source/Documentation/email-clients.txt may confuses most of us because Editor Instruction is not very clear so we should follow following steps after installing ThunderBird Email Client. 1:Select compose New Email option by clicking on Write

How is memory allocated between the different TCP queues ?

2014-06-19 Thread Teto
Hi, I know there are different TCP queues (prequeue/backlog/out of order) depending on the state of the application. I was wondering how the values set in net.ipv4.tcp_rmem were ventilated (allocated) between the different queues ? For instance can the out of order queue represent 100% of

How to get the average/max process scheduling latency

2014-06-19 Thread Teto
Hi, I would like to retrieve the average latency between 2 schedulings of an application. The purpose is to model the service time of the application (ie. How fast it can empty the TCP buffer). I could not find an answer yet. I've found that on latest kernel latency is on average around 3us with

Re: Why the page tables are needed for lowmem?

2014-06-19 Thread Rik van Riel
On 06/18/2014 11:21 PM, sandeep kumar wrote: Hi All i was going through mm initialization code, and saw paging_init() implementation. it has a function map_lowmem(). I was wondering why do we need page table entries for lowmem ?? because all the pages in lowmem can be addressed by

Re: How to get the average/max process scheduling latency

2014-06-19 Thread Valdis . Kletnieks
On Mon, 16 Jun 2014 18:23:56 +0200, Teto said: I could not find an answer yet. I've found that on latest kernel latency is on average around 3us with a max at 64us (I consider a moderate load). Is that correct ? Depends on your hardware and system load. I'd hardly expect the same numbers

pow calculation in kernel

2014-06-19 Thread ????
Hi: I am doing a research on D2TCP(http://dl.acm.org/citation.cfm?id=2342388), I just want to implement it into the linux kernel. When calculating the penalty function, it is p = a^d, where 0 a 1 and 0 d 1. Since the kernel only offers integer, so in my code, so I let a multiply 2^10.

Re: pow calculation in kernel

2014-06-19 Thread John de la Garza
On Fri, Jun 20, 2014 at 09:55:02AM +0800, 张晗 wrote: Hi: I am doing a research on D2TCP(http://dl.acm.org/citation.cfm?id=2342388), I just want to implement it into the linux kernel. When calculating the penalty function, it is p = a^d, where 0 a 1 and 0 d 1. Since the kernel only