Re: Help - memory leak issue in SCSI stack

[Ming Zhang <mingz@ele.uri.edu>]

On Fri, 2004-08-27 at 18:59, Lee Xing wrote:
> Hi,
> 
> I think the following issue is memory leak related but not sure how to narrow it down.  Your help and suggestion would be helpful.
> 
> - Test Environment
>     - RH Linux 9.0 (lk2.4) with patch 2.4.20-30.9
>     - Dell 1U server with 2 SCSI disks.  The first
>       one hold OS and utilities, while the 2nd one
>       (Seagate ST318453LC) is the target iometer
>       sends I/O to.
>     - 2GB memory
>     - Linux 'Hardware Browser' -> 'SCSI devices'
>       shows "LSI 53c1030, Driver: mptscsih".  This
>       is probably the built-in SCSI HBA but I'm not
>       100% sure.  I can double check if some one
>       tells me how.
>     - iometer (v. 2003.12.16) and dynamo (v. 2003.12.16)
ps, iometer has new version now.

> 
> - Symptom
>     run iometer on a different Windows machine, and 
>     dynamo (the iometer client for Linux) on the Dell
>     server.  Use 'top' utility on Linux to trace the
>     memory usage.  Here is what I observed:
> 
>     Time (min)       Used Memory (MB)
>         0                 305
>         1                 461
>         2                 589
>         3                 679
>         4                 787
>         5                 894
>         6                 898
>         7                 973
>        10                 1087
>        15                 1087
>        20                 1087
>        30                 1087
these memory can be used as cache or buffer, check u /proc/meminfo.

> 
> - Question
> Can we say there is a memory leak somewhere based on the above table?  If not, then why the amount of used memory keeps increasing within a certain period of time?  If so, why the amount of used memory stops increasing after 10 mins, and how I can trace which layer or component causes it?  
can u set a text wrap? this long line is so hard to read for terminal.

> 
> If I understand right, the following layers/components are involved in this I/O test:
> 
>     - Linux upper-level (sd) driver
>     - Linux mid-lever driver
>     - LSI low-level driver mptscsih (if the
>       built-in SCSI HBA does come from LSI).
>     - Linux libs, etc.
>     - iometer
> 
> Any suggestion and idea would be appreciated.
> 
> Have a nice weekend!
> 
> 
> Lee
> -
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-- 
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| Dept. of Electrical & Computer Engineering
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