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eefe7fb19e
Support virtio-fs's DAX (direct memory access) operation which allows the guest
to directly access file pages.
Specifically, FUSE_SETUP_MAPPING and FUSE_REMOVE_MAPPING operations are
supported.
This option can be used by specifing `dax` option when mount a file system in
the guest.
The DAX optoin improved file I/O performance in most cases.
In Fio tests, both of read and write score were improved by 1.3-14x depending on
test cases.
In Blogbench tests, which create many small files, DAX improved the write score
by 1.5x while the read score was reduced to ~25% (20391 -> 4593).
Here is an excerpt of results:
Fio
* seq_read: 10.2x (143528 -> 1464911)
* seq_write: 3.3x (61253 -> 896791)
* rand_read: 11.6x (138753 -> 1612739)
* rand_write: 14.6x (61253 -> 896791)
* surfing_read: 1.3x (98473 -> 127907)
* surfing_write: 1.3x (83309 -> 108089)
Blogbench
* read: 0.23x (20391 -> 4593)
* write: 1.50x (248 -> 373)
BUG=b:147341783
TEST=Run vm.{Blogbench, Fio} with CL:2291856
Change-Id: I4a47c601412ed32d926de6304337e1594252d258
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/2108315
Tested-by: kokoro <noreply+kokoro@google.com>
Tested-by: Keiichi Watanabe <keiichiw@chromium.org>
Commit-Queue: Keiichi Watanabe <keiichiw@chromium.org>
Reviewed-by: Chirantan Ekbote <chirantan@chromium.org>
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| poll_token_derive | ||
| src | ||
| .build_test_serial | ||
| Cargo.toml | ||