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cached_fs_rom: increase fs buffer size to 4 MiB

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The default file-system communication-buffer size of 128 KiB combined
with the clamping of requests to 1/4th the buffer size results in the
fragementation of read operations into 32 KiB chunks. This is overly
conservative and causes high context-switch overhead down the storage
stack (vfs server -> part_block -> block driver).

Related to #4613
This commit is contained in:
Norman Feske 2022-09-15 14:16:26 +02:00 committed by Christian Helmuth
parent 20df224b19
commit 8bccc6e68f
1 changed files with 2 additions and 2 deletions
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4
repos/os/src/server/cached_fs_rom/main.cc
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@ -167,7 +167,7 @@ struct Cached_fs_rom::Transfer final
if (!_fs.tx()->ready_to_submit()) if (!_fs.tx()->ready_to_submit())
throw Packet_alloc_failed(); throw Packet_alloc_failed();
size_t chunk_size = (size_t)min(_size, _fs.tx()->bulk_buffer_size()/4); size_t chunk_size = (size_t)min(_size, _fs.tx()->bulk_buffer_size()/2);
return _fs.tx()->alloc_packet(chunk_size); return _fs.tx()->alloc_packet(chunk_size);
} }
@ -280,7 +280,7 @@ struct Cached_fs_rom::Main final : Genode::Session_request_handler
Heap heap { env.pd(), env.rm() }; Heap heap { env.pd(), env.rm() };
Allocator_avl fs_tx_block_alloc { &heap }; Allocator_avl fs_tx_block_alloc { &heap };
File_system::Connection fs { env, fs_tx_block_alloc }; File_system::Connection fs { env, fs_tx_block_alloc, "", "/", false, 4*1024*1024 };
Session_requests_rom session_requests { env, *this }; Session_requests_rom session_requests { env, *this };