users April 2010

users@lists.genode.org

5 participants
7 discussions

Further questions
by Peter Nguyen 30 Mar '12

30 Mar '12

Hi, Thanks you very much for that. I now have it running. I have another question about Genode. More specifically, I was wondering whether any of the Iguana services at all. I ask this given that the weaver.xml file refers to memsections and pds (i'm assuming that means protection domains). Peter ----- Forwarded message from Norman Feske <norman.feske@...1...> ----- Date: Tue, 05 Jan 2010 08:43:36 +0100 From: Norman Feske <norman.feske@...1...> Reply-To: Genode OS Framework Mailing List <genode-main(a)lists.sourceforge.net> Subject: Re: Broken assertion To: Genode OS Framework Mailing List <genode-main(a)lists.sourceforge.net> Hi Peter, this is a different error as the one mentioned in the Wiki. It actually tells you what's wrong. ;-) In the 'weaver.xml' file, there is a memsection referring to a file called 'config'. This is the configuration file of Genode's init process. You can use a copy of the template provided at 'os/config/demo'. You can either specify this file as filename for the 'config' module entry in 'weaver.xml' or copy it to your '<builddir>/bin/' directory (and of course rename it to 'config'). This bit was missing in the Wiki. So I added it to the Wiki page. Thank you for pointing it out. Norman Peter Nguyen wrote: > Hi, > > In the wiki describing how to build Genode on OKL4, does the bug alert refer to > following message: An error occurred: [Errno 2] No such file or directory: > 'config'? > > I've followed the build instructions, and i've changed the value as suggested as > the quick fix, but I still get this error. > > As usual, any help would be greatly appreciated. > > Peter ------------------------------------------------------------------------------ This SF.Net email is sponsored by the Verizon Developer Community Take advantage of Verizon's best-in-class app development support A streamlined, 14 day to market process makes app distribution fast and easy Join now and get one step closer to millions of Verizon customers http://p.sf.net/sfu/verizon-dev2dev _______________________________________________ Genode-main mailing list Genode-main(a)lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/genode-main ----- End forwarded message -----

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Thread blocking
by Peter Nguyen 28 Apr '10

28 Apr '10

Hi, In messing around a bit further with the http server code, I decided to have a go at making the HTTP server multithreaded. In this case, I wanted the web server to function such that when a HTTP request is received, a new thread is created whose purpose is to handle the HTTP request. In other words, the http_server_serve() function is made a thread, as opposed it being just a function. However, in making the changes, the execution seems to result in the web server hanging, with the HTTP handler thread not executing at all. This seem to be the case because inserting a call to sleep (via the timer connection) in main() resulted in the HTTP handler function executing. I would have thought that as soon as a HTTP request is received, the main thread would block, and from there schedule the HTTP handler thread (I have invoked start() on this thread, by the way). At the moment, it seems that the main thread blocking seems to result in the entire web server hanging. Any ideas as to what's going on? Peter

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message buffer is too small
by Peter Nguyen 28 Apr '10

28 Apr '10

Hi, In moving my sampling code to version 10.02 of genode, and running the sampling functionality, I keep getting the following message during runtime: void copy_utcb_to_msgbuf(Okl4::L4_MsgTag_t, Genode::Msgbuf_base*): receive message buffer too small msg size=2c, buf size=16 Is there a way for me to change the size? Another point I should mention is that this output appears as a result of using L4 IPC. Peter

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Website down
by Peter Nguyen 20 Apr '10

20 Apr '10

Hi, Is it just me, or is the genode website down at the moment? ----------------------------------------------------- Peter Nguyen Jacaranda Research Group

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Weird build error
by Peter Nguyen 19 Apr '10

19 Apr '10

Hi, In using the latest genode version via OKL4 (an unmodified build), and trying to include nic_drv and the http server as part of config, I keep getting the the "no RM attachment" error. This is the output i get when i only include "nic_drv" in the config. int main(): --- create local services --- int main(): --- start init --- int main(): Ok we have 39 MB transfered to init int main(): --- init created, waiting for exit condition --- [init] our quota limit is 41009152 [init] our used quota is 135168 [init] starting timer with quota=524288 [init] using unique child name "timer" [init] starting pci_drv with quota=524288 [init] using unique child name "pci_drv" [init] starting nic_drv with quota=2097152 [init] using unique child name "nic_drv" no RM attachment (READ pf_addr=0 pf_ip=203891c from 04) virtual void Genode::Signal_session_component::submit(Genode::Signal_context_capability, unsigned int): invalid signal-context capability [init -> pci_drv] PCI driver started [init] pci_drv registered service PCI [init] timer registered service Timer I have no idea as to what's going on. The contents of the config file is the following: <config> <start> <filename>timer</filename> <ram_quota>512K</ram_quota> </start> <start> <filename>pci_drv</filename> <ram_quota>512K</ram_quota> </start> <start> <filename>nic_drv</filename> <ram_quota>2M</ram_quota> </start> </config> The quota for nic_drv was originally 512K. Changing it to 2M hasn't helped at all. Attached is the weaver file I am using as well. Can anyone tell me what i've done wrong? Peter

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Rom FS
by Peter Nguyen 14 Apr '10

14 Apr '10

Hi, I noticed that as part of booting up Genode that the contents of the rom FS is printed (provided the variable is set for enabling verbose printing of boot information). Is there a way of having access to this data in my profiling environment? Having access to this information would greatly help with my system profiling. Peter

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Experiences
by Peter Nguyen 14 Apr '10

14 Apr '10

Hi, I was asked to summarize my experiences with using shared memory in Genode. Apologies for the extremely late reply. My project involves implementing a profiling infrastructure, whereby i have a profiling server that coordinates the execution of profiling ie. the collection and processing of samples. Samples are to be collected from a range of sources, where the samples generated are analysed by the profiling server. The issue I was having was the sharing of memory between the profiling server and the component where the samples were being generated. Via regular communication with the Genode developers, I got to reading up on the use of Dataspaces as the mechanism for sharing data between two components. Essentially, memory sharing between components is achieved by creating a dataspace, where a memory region is defined such that data written to this memory is shared. The actual sharing occurs by having a component (in this case a client) establish a connection to the server, which allocates the dataspaces. In my profiling design, a sampling buffer that is shared between a client and a server is only relevant to that connection only ie. other components do not really need to know about this data. To illustrate this, i will use a diagram that Christian used in helping me with establishing data sharing between components: Address | Dataspaces and Sharing spaces | ---------------------------------------------- ---------------------------------------------- Sampling | Sample Sample Server | buffer A buffer B ---------------------------------------------- Sampled | Sample - client A | buffer A - ---------------------------------------------- Sampled | - Sample client B | - buffer B In the above diagram, the data generated in "Sampled client A" has no relevance whatsoever to "Sampled client B". Hence, I don't need to worry about Sampled client A and Sampled client B having to share its profiling data with each other (i'm sure there might be cases where such sharing is to occur, for instance, if the intention is to write sampling data to the same buffer). The motivation for this design is that each sampling buffer represents a particular part of the system being profiled. For example, Sampled client A could represent a HTTP server for profiling network activity, and Sampled client B could represent a kernel buffer to obtain CPU samples. I could then have another sampled client that measures the rate at which Genode threads are being created (there obviously might be better examples of another client). Sample processing is then performed by the server, via a language I have implemented (the code gets converted to C++ code). The client-server approach that Genode motivates makes the profiling environment easily extensible because the creation of a sampling buffer simply involves having the client to be sampled establish a connection to the profiling server (I have a connection.h file as part of the sampling_session interface, which I learned about from the hello world tutorial). After declaring the connection to the profiling server, a dataspace capability is obtained from this connection and from there, the dataspace is attached to the client's local address space, which results in data sharing now working. The code snippet below should illustrate what I just explained. Sampling::Connection samp; Dataspace_capability ds = samp.get_cap(); void *ptr = Genode::env()->rm_session()->attach(ds); I can then write data via *ptr, knowing that the data is shared with the profiling server. So i've probably gone all over the place with this email, but hopefully someone might get something out of this. Peter

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users April 2010