Bug 73646 - [ahd] I/O performance: with/without MEMIO option
Summary: [ahd] I/O performance: with/without MEMIO option
Status: Closed FIXED
Alias: None
Product: Base System
Classification: Unclassified
Component: kern (show other bugs)
Version: 5.2.1-RELEASE
Hardware: Any Any
: Normal Affects Only Me
Assignee: freebsd-bugs (Nobody)
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2004-11-07 17:40 UTC by wkwu
Modified: 2008-02-24 15:48 UTC (History)
0 users

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Description wkwu 2004-11-07 17:40:16 UTC 
We ran more than 20000 processes concurrently. Each process requests for
random disk I/O for small files. (reading/writing)

With AHA aic7892/7899 (AHC_ALLOW_MEMIO enabled), the system works well.

With AHA aic7901/7902 (use "ahd" driver), the system works bad.
The console hangs frequently. Each process hangs frequently.

With LSI 1030 (mpt driver), the system works soso.
Comment 1 Ceri Davies freebsd_committer freebsd_triage 2004-11-08 11:41:20 UTC 
Responsible Changed
From-To: freebsd-advocacy->freebsd-bugs

Not an advocacy PR.
Comment 2 Volker 2008-02-22 21:07:50 UTC 
Wei-Kai,

I'm wondering if you've been able to repeat your stress test with a
later FreeBSD release and have seen a better performance behavior?

If so, please report back if we can close this PR.

Thanks!
Comment 3 Mark Linimon freebsd_committer freebsd_triage 2008-02-23 03:10:07 UTC 
State Changed
From-To: open->feedback

Note that submitter has been asked for feedback.
Comment 4 wkwu.mutt 2008-02-24 13:55:03 UTC 
Dear Volker,

I have no such environment to continue the stress test.

Please close the PR, thanks!
Comment 5 Remko Lodder freebsd_committer freebsd_triage 2008-02-24 15:48:32 UTC 
State Changed
From-To: feedback->closed

Submitter reports this can be closed. Make it happen