bahman/scylla
1
0
Fork 0
Code Issues Pull Requests Actions 2 Packages Projects Releases Wiki Activity

checked_file: preserve DMA alignment

Browse Source 
Inherit the alignment parameters from the underlying file instead of
defaulting to 4096.  This gives better read performance on disks with 512-byte
sectors.

Fixes #1532.
Message-Id: <1470122188-25548-1-git-send-email-avi@scylladb.com>

(cherry picked from commit 9f35e4d328)
This commit is contained in:
Avi Kivity
2016-08-02 10:16:28 +03:00
parent 8243d3d1e0
commit a556265ccd
1 changed files with 5 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
checked-file-impl.hh
View File

@@ -28,7 +28,11 @@ class checked_file_impl : public file_impl {
public:
checked_file_impl(disk_error_signal_type& s, file f)
: _signal(s) , _file(f) {}
: _signal(s) , _file(f) {
_memory_dma_alignment = f.memory_dma_alignment();
_disk_read_dma_alignment = f.disk_read_dma_alignment();
_disk_write_dma_alignment = f.disk_write_dma_alignment();
}
virtual future<size_t> write_dma(uint64_t pos, const void* buffer, size_t len, const io_priority_class& pc) override {
return do_io_check(_signal, [&] {