Hi all,
I am using Click on Mac OS X in userlevel mode, and have found a poor prfomance
in FromDevice element for that mode.
The problem is in missing actual call to ioctl with BIOCIMMEDIATE on pcap file
descriptor at runtime, and without that ioctl pcap_fd left in buffered mode.
Here is a patched section of elements/userlevel/fromdevice.cc. First line is
line 260 in original file:
//# if defined(BIOCIMMEDIATE) && !defined(__sun) // pcap/bpf ioctl, not in
DLPI/bufmod
{
int r, yes = 1;
if ((r = ioctl(pcap_fd, /*BIOCIMMEDIATE*/_IOW('B',112, u_int),
&yes)) == -1)
return errh->error("%s: BIOCIMMEDIATE: %s", ifname,
strerror(errno));
/*else if (r != 0)
errh->warning("%s: BIOCIMMEDIATE returns %d", ifname, r);*/
errh->warning("%s: BIOCIMMEDIATE returns %d", ifname, r);
}
//# endif
To force put pcap_fd in unbuffered mode, I commented out "#if defined"
directives and insert a "_IOW('B',112, u_int)" instead of "BIOCIMMEDIATE" in
"ioctl" to avoid include files conflicts.
It is just quick hack, not a solution!
Hope that will be helpful for somebody.
--
Regards,
Dmitriy Bubnov
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