From mboxrd@z Thu Jan 1 00:00:00 1970 From: bgat@billgatliff.com (Bill Gatliff) Date: Thu, 20 May 2010 12:18:06 -0500 Subject: Support Question In-Reply-To: References: <1274199223.1763.0.camel@ubuntu.ubuntu-domain> Message-ID: <4BF56ECE.9030303@billgatliff.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 05/19/2010 12:06 PM, Amit kumar wrote: > > > Therefore I don;t have any idea from where the delay is being > introduced. Is it a problem of OS or there is nythng else involved . > Kindly guide me through this . I need urgent help .... any information > abt delay is welcome. The SPI drivers usually have a kernel thread to deal with transmissions and chip selects. Make sure that kernel thread is on the RT scheduler, otherwise it gets prioritized along with user applications--- which would explain the delay you are seeing. b.g. -- Bill Gatliff bgat at billgatliff.com