Revision c4c0ce5c57ef0ca47a4428a14de6b5c8cdf8de8a authored by Ilpo Järvinen on 04 August 2006, 23:36:18 UTC, committed by David S. Miller on 05 August 2006, 05:59:51 UTC
Overflow can occur very easily with 32 bits, e.g., with 1 second us_idle is approx. 2^20, which leaves only 11-Wlog bits for queue length. Since the EWMA exponent is typically around 9, queue lengths larger than 2^2 cause overflow. Whether the affected branch is taken when us_idle is as high as 1 second, depends on Scell_log, but with rather reasonable configuration Scell_log is large enough to cause p->Stab to have zero index, which always results zero shift (typically also few other small indices result in zero shift). Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi> Signed-off-by: David S. Miller <davem@davemloft.net>
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| crypto | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
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| sound | ||
| usr | ||
| .gitignore | -rw-r--r-- | 521 bytes |
| COPYING | -rw-r--r-- | 18.3 KB |
| CREDITS | -rw-r--r-- | 87.4 KB |
| Kbuild | -rw-r--r-- | 1.2 KB |
| MAINTAINERS | -rw-r--r-- | 70.4 KB |
| Makefile | -rw-r--r-- | 46.1 KB |
| README | -rw-r--r-- | 16.2 KB |
| REPORTING-BUGS | -rw-r--r-- | 3.0 KB |
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