Comment 74 for bug 595047

With the following code I got negative time differences about -127ms. The tv_sec values where equal and the second tv_usec was smaller than the first. I cannot say which kernel it was, as I am no more able to reproduce it. Some days before it occurs on nearby every test. As this behaviour is connected with TSC synchronisation patch, I have posted it here. I will try to figure out the kernel version.

> gettimeofday(&tv_s, &tz);
> write(a2b[1], &c, 1);
> read(b2a[0], &c, 1);
> gettimeofday(&tv_e, &tz);
> timersub(&tv_e, &tv_s, &tv_r);