genode

History

Norman Feske bbe3ee8dc5 block_session: server-defined payload alignment This patch replaces the formerly fixed 2 KiB data alignment within the packet-stream buffer by a server-defined alignment. This has two benefits. First, when using block servers that provide small block sizes like 512 bytes, we avoid fragmenting the packet-stream buffer, which occurs when aligning 512-byte requests at 2 KiB boundaries. This reduces meta data costs for the packet-stream allocator and also allows fitting more requests into the buffer. Second, block drivers with alignment constraints dictated by the hardware can now pass those constraints to the client, thereby easing the use of zero-copy DMA directly into the packet stream. The alignment is determined by the Block::Session_client at construction time and applied by the Block::Session_client::alloc_packet method. Block-session clients should always use this method, not the 'alloc_packet' method of the packet stream (tx source) directly. The latter merely applies a default alignment of 2 KiB. At the server side, the alignment is automatically checked by block/component.h (old API) and block/request_stream.h (new API). Issue #3274		2019-05-03 13:53:12 +02:00
..
README	Consistently name block components	2019-01-14 12:34:39 +01:00
main.cc	block_session: server-defined payload alignment	2019-05-03 13:53:12 +02:00
target.mk	Consistently name block components	2019-01-14 12:34:39 +01:00

README

ROM loop device is an implementation of the block-session interface
running as a client of a ROM session. It exports the requested ROM file as a
block device, similiar to loop devices known in Linux. The example shows how
to choose the right ROM file in its configuration and how to configure the exported block size.

! <config file="image.iso" block_size="2048"/>