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VFS: Configure File_system client buffer at runtime 

Make the size of the packet buffer at the VFS File_system client
configurable. This allows larger reads to be completed in a single
packet cycle.

Example: <vfs> <fs buffer_size="512K"/> </vfs>

Fix #3167
This commit is contained in:
Ehmry - 2019-02-18 16:23:45 +01:00 committed by Norman Feske
parent 4921388732
commit 2f33d44713
1 changed files with 9 additions and 2 deletions
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11
repos/os/src/lib/vfs/fs_file_system.h
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@ -7,7 +7,7 @@
*/
/*
* Copyright (C) 2012-2017 Genode Labs GmbH
* Copyright (C) 2012-2019 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU Affero General Public License version 3.
@ -628,6 +628,13 @@ class Vfs::Fs_file_system : public File_system
Genode::Io_signal_handler<Fs_file_system> _ready_handler {
_env.env().ep(), *this, &Fs_file_system::_ready_to_submit };
static
Genode::size_t buffer_size(Genode::Xml_node const &config)
{
Genode::Number_of_bytes fs_default { ::File_system::DEFAULT_TX_BUF_SIZE };
return config.attribute_value("buffer_size", fs_default);
}
public:
Fs_file_system(Vfs::Env &env, Genode::Xml_node config)
@ -638,7 +645,7 @@ class Vfs::Fs_file_system : public File_system
_fs(_env.env(), _fs_packet_alloc,
_label.string(), _root.string(),
config.attribute_value("writeable", true),
::File_system::DEFAULT_TX_BUF_SIZE)
buffer_size(config))
{
_fs.sigh_ack_avail(_ack_handler);
_fs.sigh_ready_to_submit(_ready_handler);