Messages in this thread | | | From | Duncan Sands <> | Subject | Re: [PATCH] Re: Shared memory shmat/dt not working well in 2.5.x | Date | Tue, 8 Oct 2002 13:38:50 +0200 |
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> I also observed that other application I use occasionally - LXR (Linux > source cross referencing tool) - takes much longer to generate xref > database (which is in Berkeley DB files). It works in three passes, > where the last one, when it dumps symbols into DB, is interesting. In > 2.4 it finishes quickly (it uses 100% CPU, then occasionally syncs the > databases - heavy write traffic for a second - then continues), but > 2.5 has problems with it (it stucks writing to disk all the time, CPU > usage is minimal and process progresses very slowly). Andrew, if > you're interested I can send you some numbers to describe the case > better.
Hmmm, are you using ext3? Changes to the meaning of yield sometimes make fsync go very slowly. This problem has been around since 2.5.28, and hasn't yet been fixed (As for a fix, Andrew Morton said "I'll sit tight for the while, see where shed_yield() behaviour ends up").
All the best,
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