[Illumos-team] [OpenIndiana Distribution - Bug #1148] (New) Serious performance regression using CompactFlash as rpool ( cmdk, zfs? )

[illumos project]

Issue #1148 has been updated by Chris Jordan.

Status changed from Feedback to New
Assignee set to OI illumos
Tags changed from needs-triage to compactflash

Thanks for the benchmarks.  I'm assigning this to "OI Illumos" for further investigation since the problem appears clearly to be one of the kernel or the drivers.
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Bug #1148: Serious performance regression using CompactFlash as rpool ( cmdk, zfs? )
https://www.illumos.org/issues/1148

Author: Ivan Debnár
Status: New
Priority: Normal
Assignee: OI illumos
Category: Drivers
Target version: 
Difficulty: Medium
Tags: compactflash


I have been using OpenSolaris 134b for a year on several Sun Fire x4540 - Thor systems, booting from Compact Flash slot ( on the back ). No problems with that - performance when booting, altering svcs, anythink is acceptable.

After pkg image-update to OpenIndiana 148, or dev-il ( 151 ), both suffer serious performance regression when using this Compact Flash - it's like 8-10 times slower.

Booting to OS134 bootenviroment - everythings fast. Tried various CF cards - under 134 fast, under 148,151 unusably slow.

Turning sync on rpool didn't help. 

Was there some change in the kernel drivers cmdk or zfs that could cause this regression between 134 and 148?

Attached is complete Oracle Explorer output.

On systems with read harddisks as rpool, OI is great so far.



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