Optionally use the IOCache instead of the IOScheduler (specified by

USE_IO_CACHE macro in the header). Currently disabled, though. It works fine,
if the machine has a good deal of RAM. I tested with the anyboot CD -- the
boot and installation times drop dramatically. On machines with little RAM
there are issues, though. Apparently the cache isn't drained fast enough, so
that other allocations can fail.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@36438 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/kernel/drivers/disk/scsi/scsi_cd/scsi_cd.cpp

@@ -884,7 +884,13 @@ cd_set_capacity(cd_driver_info* info, uint64 capacity, uint32 blockSize)
 		if (status != B_OK)
 			panic("initializing DMAResource failed: %s", strerror(status));
 
+#if USE_IO_CACHE
+		info->io_scheduler = new(std::nothrow) IOCache(info->dma_resource,
+			1024 * 1024);
+#else
 		info->io_scheduler = new(std::nothrow) IOScheduler(info->dma_resource);
+#endif
+
 		if (info->io_scheduler == NULL)
 			panic("allocating IOScheduler failed.");
 
@@ -896,6 +902,11 @@ cd_set_capacity(cd_driver_info* info, uint64 capacity, uint32 blockSize)
 		info->io_scheduler->SetCallback(do_io, info);
 	}
 
+#if USE_IO_CACHE
+	if (info->io_scheduler != NULL)
+		info->io_scheduler->SetDeviceCapacity(capacity * blockSize);
+#endif
+
 	info->block_size = blockSize;
 }
 

src/add-ons/kernel/drivers/disk/scsi/scsi_cd/scsi_cd.h

@@ -12,6 +12,7 @@
 #include <scsi.h>
 
 #include "dma_resources.h"
+#include "IOCache.h"
 #include "IORequest.h"
 #include "IOScheduler.h"
 
@@ -19,13 +20,20 @@
 #define SCSI_CD_DRIVER_MODULE_NAME "drivers/disk/scsi/scsi_cd/driver_v1"
 #define SCSI_CD_DEVICE_MODULE_NAME "drivers/disk/scsi/scsi_cd/device_v1"
 
+// enables using the IOCache instead of the IOScheduler
+#define USE_IO_CACHE	0
+
 
 struct cd_driver_info {
 	device_node*			node;
 	::scsi_periph_device	scsi_periph_device;
 	::scsi_device			scsi_device;
 	scsi_device_interface*	scsi;
+#if USE_IO_CACHE
+	IOCache*				io_scheduler;
+#else
 	IOScheduler*			io_scheduler;
+#endif
 	DMAResource*			dma_resource;
 
 	uint64					capacity;