sl@0: // Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies).
sl@0: // All rights reserved.
sl@0: // This component and the accompanying materials are made available
sl@0: // under the terms of the License "Eclipse Public License v1.0"
sl@0: // which accompanies this distribution, and is available
sl@0: // at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: //
sl@0: // Initial Contributors:
sl@0: // Nokia Corporation - initial contribution.
sl@0: //
sl@0: // Contributors:
sl@0: //
sl@0: // Description:
sl@0: // f32\sfile\sf_file_cache_defs.h
sl@0: // This file contains default settings for file caching. 
sl@0: // Some of these settings may be overriden by appropriate entries in the estart.txt file
sl@0: // Sizes / lengths specified in kilobytes, timeouts in miliseconds
sl@0: // 
sl@0: //
sl@0: 
sl@0: /**
sl@0:  @file
sl@0:  @internalTechnology
sl@0: */
sl@0: 
sl@0: 
sl@0: // Global file-cache settings 
sl@0: const TBool KDefaultGlobalCacheEnabled			= ETrue; 
sl@0: const TInt KDefaultGlobalCacheSize				= (32*1024);	// 32768 K = 32 MBytes - the maximum for all files
sl@0: // The maximum amount of locked data allowed for all files
sl@0: const TInt KDefaultGlobalCacheMaxLockedSize	= (1*1024);		// 1 Mb maximum locked data
sl@0: // Low memory threshold as a percentage of total RAM.
sl@0: // If the amount of RAM drops below this value, attempts to allocate memory for a file caching will fail
sl@0: const TInt KDefaultLowMemoryThreshold			= 10;			// 10 % of total RAM
sl@0: 
sl@0: // per-drive file-cache settings. 
sl@0: const TInt KDefaultFileCacheMaxReadAheadLen	= (128);	// 128K	// NB non-configurable by estart
sl@0: const TInt KDefaultFileCacheSize				= (256);	// 256K
sl@0: const TInt KDefaultFairSchedulingLen			= (128);	// 128K
sl@0: 
sl@0: 
sl@0: enum {EFileCacheFlagOff, EFileCacheFlagEnabled, EFileCacheFlagOn};
sl@0: 
sl@0: // default drive cache settings - these may be overridden by estart.txt settings or file open mode 
sl@0: 
sl@0: const TInt KDefaultFileCacheRead				= EFileCacheFlagEnabled;
sl@0: const TInt KDefaultFileCacheReadAhead			= EFileCacheFlagOn;		// NB only enabled if read caching also enabled
sl@0: const TInt KDefaultFileCacheWrite				= EFileCacheFlagEnabled;
sl@0: 
sl@0: /**
sl@0: If set to ETrue, media driver reads on this drive are considered to be asynchronous 
sl@0: i.e. interrupt driven. This results in read-aheads being issued before completing a client read request.
sl@0: 
sl@0: If set to EFalse, media driver reads on this drive are considered to be synchronous 
sl@0: i.e. issuing a read-ahead is likely to block any client thread which will normally be running at
sl@0: lower priority than the media driver's thread. In this case read-aheads only happen during periods 
sl@0: of inactivity so as to improve latency: this is achieved by lowering the process of the drive thread
sl@0: if there is only one read-ahead request in the drive thread's queue.
sl@0: */
sl@0: const TInt KDefaultFileCacheReadAsync			= ETrue;
sl@0:  
sl@0: // time after which a file will be removed from closed file queue
sl@0: const TInt KDefaultClosedFileKeepAliveTime = 3000;			// 3,000 ms = 3 seconds
sl@0: 
sl@0: // time after which a file containing dirty data will be flushed
sl@0: const TInt KDefaultDirtyDataFlushTime = 3000;				// 3,000 ms = 3 seconds
sl@0: