Which basically shows one fsync, no O_SYNC's, and setting of the flag
only for klog reads.
Which sysklogd do you look at? The version from RedHat 9 contains this block:
/* * Crack a configuration file line */
void cfline(line, f) char *line; register struct filed *f; { register char *p; [snip] if (*p == '-') { syncfile = 0; p++; } else syncfile = 1; [snip] if (syncfile) f->f_flags |= SYNC_FILE;
And the the fsync depends on SYNC_FILE. As documented in man syslog.conf:
You may prefix each entry with the minus ``-'' sign to omit syncing the
file after every logging. Note that you might lose information if the
system crashes right behind a write attempt. Nevertheless this might
give you back some performance, especially if you run programs that use
logging in a very verbose manner.
It's sysklogd-1.4.1rh, I'm not sure what part of it are Redhat specific.
-- Manfred
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