Message-ID: <422FB2B5.3070803@yahoo.com>
Date: Wed, 09 Mar 2005 18:36:37 -0800
From: Alex Aizman <itn780@yahoo.com>
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To: Lars Marowsky-Bree <lmb@suse.de>
CC: Matt Mackall <mpm@selenic.com>, linux-scsi@vger.kernel.org,
       linux-kernel@vger.kernel.org
Subject: Re: [ANNOUNCE 0/6] Open-iSCSI High-Performance Initiator for Linux
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Lars Marowsky-Bree wrote:

>On 2005-03-08T22:25:29, Alex Aizman <itn780@yahoo.com> wrote:
>  
>
>>There's (or at least was up until today) an ongoing discussion on our 
>>mailing list at http://groups-beta.google.com/group/open-iscsi. The 
>>short and long of it: the problem can be solved, and it will. Couple 
>>simple things we already do: mlockall() to keep the daemon un-swapped, 
>>and also looking into potential dependency created by syslog (there's 
>>one for 2.4 kernel, not sure if this is an issue for 2.6).
>>    
>>
>
>BTW, to get around the very same issues, heartbeat does much the same:
>lock itself into memory, reserve a couple of pages more to spare on
>stack & heap, run at soft-realtime priority.
>  
>
Heartbeat is good for reliability, etc. WRT "getting paged-out" - 
non-deterministic (things depend on time), right?

>syslog(), however, sucks.
>  
>
It does.

>We went down the path of using our non-blocking IPC library to have all
>our various components log to ha_logd, which then logs to syslog() or
>writes to disk or wherever.
>  
>

Found ha_logd under http://linux-ha.org. The latter is extemely 
interesting in the longer term. In the short term, there's quite a bit 
of information on this site, need time.

>That works well in our current development series, and if you want to
>share code, you can either rip it off (Open Source, we love ya ;) or we
>can spin off these parts into a sub-package for you to depend on...
>
>  
>
If it's not a big deal :-) let's do the "sub-package" option.

>>The sfnet is a learning experience; it is by no means a proof that it 
>>cannot be done.
>>    
>>
>
>I'd also argue that it MUST be done, because the current way of "Oh,
>it's somehow related to block stuff, must be in kernel" leads down to
>hell. We better figure out good ways around it ;-)
>  
>
Yes, it MUST be done.

>
>Sincerely,
>    Lars Marowsky-Br?e <lmb@suse.de>
>
>  
>
Alex
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