2.2.18 vanilla on SMP, latency

Same latencies as 2.2.16 and 2.2.17 vanilla,
over 75 seconds to wait on an other screen!
And top(1) on a serial VT510 freezes.

Machine loaded with 2 setiathome and
Doug Ledford's memtest.

ASUS P2B-DS Dual PIII550 1024MB memory,
only SCSI devices (no IDE!).

Andrea Arcangeli's ..17pre6aa2, ..18pre17aa1
and ..18pre21aa2 reduced the latency <2 secs.

Regards
Mario Vanoni

PS If necessary, cc, not in lkml!
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Patched with Andrea's 2.2.18aa1, with more loads,
latency always minor 1-2 seconds.
Impossible to reproduce 75 seconds!

Mario
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