Thanks for the tip, I will had a play at tuning :) Andrew
On Fri, 2008-02-01 at 07:48 -0600, Maupin, Chase wrote: > Andrew, > > The file system cache is flushed by the pdflush threads in the kernel. When > you unmount the file system all the dirty buffers are flushed and your mem > free will return to normal (which is what you saw). You can tweak the > setting for pdflush in /proc/sys/vm. In particular if you want to try and > always have a certain amount of free memory available you can change the > settings in min_free_kbytes which will have the system avoid using all the > available memory for cache. In general though if the free memory is low and > you request more memory the cache pages will be flushed to free that memory > for use. > > Likewise, if you want to reclaim some of the cache memory without unmounting > the file system you can up the value of min_free_kbytes which will cause the > cache to be flushed until at least that much memory has been freed. > > Either way cache should flush when the memory is needed. Does this help? > > Sincerely, > Chase Maupin > Software Applications > Catalog DSP Products > e-mail: [EMAIL PROTECTED] > phone: (281) 274-3285 > > -----Original Message----- > From: Andrew Armstrong [mailto:[EMAIL PROTECTED] > Sent: Thursday, January 31, 2008 11:30 AM > To: Maupin, Chase > Cc: [email protected] > Subject: RE: Please help me for SDIO Driver > > Chase, > > I thought this might be the case, however issuing a sync does not make > any difference. Its getting to be a problem tracking this down! > > Regards, > > Andrew > > > On Thu, 2008-01-31 at 11:07 -0600, Maupin, Chase wrote: > > Andrew, > > > > The decrease in system memory may be a result of file system/buffer caching > > in the kernel not related to the driver. The unmount of the device would > > cause all dirty cache buffers to be written to the device which would > > restore the system memory. You may want to try a sync command and see if > > that will free the memory without unmounting the device. > > > > Sincerely, > > Chase Maupin > > Software Applications > > Catalog DSP Products > > e-mail: [EMAIL PROTECTED] > > phone: (281) 274-3285 > > > > -----Original Message----- > > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Andrew > > Armstrong > > Sent: Thursday, January 31, 2008 10:47 AM > > To: [email protected] > > Subject: RE: Please help me for SDIO Driver > > > > All, > > > > I am using possibly an earlier version of this driver, writing to an SD > > card. > > > > I have noticed that system memory gets progressively smaller and smaller > > during writing and is only freed when I unmount the device. Does anyone > > have any idea where this memory is ending up? Is there a way to stop > > this happening? > > > > Regards, > > > > Andrew > > > > > > On Tue, 2008-01-08 at 15:50 +0530, Nori, Sekhar wrote: > > > James, > > > > > > > > > > > > A patch adding SDIO support to the MontaVista Linux 2.6.10 LSP will be > > > posted on the TI web in near future. I suggest you wait for that patch > > > to be uploaded. > > > > > > > > > > > > Thanks, > > > Sekhar > > > > > > > > > > > > > > > ______________________________________________________________________ > > > From: NiJames [mailto:[EMAIL PROTECTED] > > > Sent: Tuesday, January 08, 2008 1:30 PM > > > To: Nori, Sekhar; Khalid ElWazeer; > > > [email protected] > > > Subject: Please help me for SDIO Driver > > > > > > > > > > > > > > > > > > > > > Dear all, > > > Help me! I'm the beginner to develop the Davanci 6446.I need to > > > develop the SDIO driver in linux 2.6.10 kernel nerarly.But I have no > > > knoweledge about how to develop.Who can give me a tested driver > > > source code for reference? Thank you in advance. > > > > > > > > > James Ni > > > > > > > > > > > > ______________________________________________________________________ > > > 轻松把Hotmail下载到本地，试试 Windows Live Mail。 立即尝试！ > > > > > > > > > _______________________________________________ > > > Davinci-linux-open-source mailing list > > > [email protected] > > > http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source > > > > > > > _______________________________________________ > > Davinci-linux-open-source mailing list > > [email protected] > > http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source > > _______________________________________________ > > Davinci-linux-open-source mailing list > > [email protected] > > http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source > _______________________________________________ Davinci-linux-open-source mailing list [email protected] http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
