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Set max readahead to a large value when mounting. 

For #10.
geesefs-0-30-9
Aaron Jacobs 2015-06-22 12:26:03 +10:00
parent 1939992b46
commit ef728f8af2
1 changed files with 20 additions and 0 deletions
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20
mounted_file_system.go
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@ -154,6 +154,26 @@ func (c *MountConfig) bazilfuseOptions() (opts []bazilfuse.MountOption) {
opts = append(opts, bazilfuse.SetOption("noappledouble", ""))
}
// Ask the Linux kernel for larger read requests.
//
// As of 2015-03-26, the behavior in the kernel is:
//
// * (http://goo.gl/bQ1f1i, http://goo.gl/HwBrR6) Set the local variable
// ra_pages to be init_response->max_readahead divided by the page size.
//
// * (http://goo.gl/gcIsSh, http://goo.gl/LKV2vA) Set
// backing_dev_info::ra_pages to the min of that value and what was sent
// in the request's max_readahead field.
//
// * (http://goo.gl/u2SqzH) Use backing_dev_info::ra_pages when deciding
// how much to read ahead.
//
// * (http://goo.gl/JnhbdL) Don't read ahead at all if that field is zero.
//
// Reading a page at a time is a drag. Ask for a larger size.
const maxReadahead = 1 << 20
opts = append(opts, bazilfuse.MaxReadahead(maxReadahead))
// Last but not least: other user-supplied options.
for k, v := range c.Options {
opts = append(opts, bazilfuse.SetOption(k, v))