VirtualBox

Ticket #11660 (closed defect: obsolete)

Opened 6 years ago

Last modified 2 years ago

Weird performance of rawdisk on SSD

Reported by: sochan Owned by:
Priority: minor Component: virtual disk
Version: VirtualBox 4.2.10 Keywords: ssd performance rawdisk
Cc: Guest type: Linux
Host type: Windows

Description

Hello there, how do yu feel this fine day?

I've started using my SSD partitions as rawdisk through vmkd image and everything works fine but HD Tune reports really weird performance bencharks results.

The SSD shows it's true speed only after 3/4ths of the test is already done. For the most part it hangs around 100MB/s then at around 80% suddenly spikes to 250MB/s. The attached screenshots document that. Access times are fine. This happens no matter how many times the test is repeated.

This very well might be a problem with how HD Tune does things but I do find it weird.

Attachments

hdtune_ssd_01.png Download (18.8 KB) - added by sochan 6 years ago.
example of a hdtune test
hdtune_ssd_02.png Download (18.6 KB) - added by sochan 6 years ago.
example of a hdtune test
hdtune_ssd_03.png Download (18.8 KB) - added by sochan 6 years ago.
example of a hdtune test
hdtune_ssd_04.png Download (19.4 KB) - added by sochan 6 years ago.
example of a hdtune test(the one from which VBox.log comes from)
VBox.log Download (99.9 KB) - added by sochan 6 years ago.
log form the fourth hdtune test

Change History

Changed 6 years ago by sochan

example of a hdtune test

Changed 6 years ago by sochan

example of a hdtune test

Changed 6 years ago by sochan

example of a hdtune test

Changed 6 years ago by sochan

example of a hdtune test(the one from which VBox.log comes from)

Changed 6 years ago by sochan

log form the fourth hdtune test

comment:1 Changed 5 years ago by klaus

Could be that the benchmarking software uses the wrong sector size... VirtualBox doesn't really know what the optimal sector size is, and thus it reports 512 bytes.

comment:2 Changed 2 years ago by aeichner

  • Status changed from new to closed
  • Resolution set to obsolete

Please reopen if this is still relevant with a recent VirtualBox release. There were quite a few I/O related fixes/optimizations since the tested release.

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