Re: [LARTC] htb: HowTo identify squid cache hits

[Konrad <kcem@tlen.pl>]

tc filter add dev <dev> protocol ip parent 1:0 pref 1 u32 match ip dst 
192.168.0.12 match ip sport 8080 0xffff match ip tos 8 0xff flowid 1:12
#If squid miss, traffic will go to user queue.


tc filter add dev imq1 protocol ip parent 1:0 pref 2 u32 match ip src 
192.168.0.22 match ip sport 8080 0xffff flowid 1:30
#this catch all traffic from source port Squid... but with priority 2 
and throw in LAN class.

I'm using this patch:

--- CUT ---

diff -cr squid-2.5.STABLE3/src/client_side.c 
squid-2.5.STABLE3.patched/src/client_side.c
*** squid-2.5.STABLE3/src/client_side.c	2003-05-24 13:08:41.000000000 +0200
--- squid-2.5.STABLE3.patched/src/client_side.c	2003-08-05 
22:08:15.000000000 +0200
***************
*** 2005,2010 ****
--- 2005,2013 ----
   	/* Avoid copying to MemBuf for non-range requests */
   	/* Note, if we're here, then 'rep' is known to be NULL */
   	http->out.offset += body_size;
+ 	{   int tos=isTcpHit(http->log_type) ? 0 : 8;
+ 	    setsockopt(fd,SOL_IP,IP_TOS,&tos,4);
+ 	}
   	comm_write(fd, buf, size, clientWriteBodyComplete, http, NULL);
   	/* NULL because clientWriteBodyComplete frees it */
   	return;
***************
*** 2062,2067 ****
--- 2065,2073 ----
       if (!http->request->range && http->request->method = METHOD_GET)
   	assert(check_size = size);
       /* write */
+     {	int tos=isTcpHit(http->log_type) ? 0 : 8;
+ 	setsockopt(fd,SOL_IP,IP_TOS,&tos,4);
+     }
       comm_write_mbuf(fd, mb, clientWriteComplete, http);
       /* if we don't do it, who will? */
       memFree(buf, MEM_CLIENT_SOCK_BUF);

--- CUT ---

If squid HIT then TOS is 0, if miss then 1.

Here is the place where you can download this: 
http://sed.pl/~mrk/qos/squid_hit_miss_mark.patch

Throw in to queue of LAN only traffic coming from Squid.
Upload traffic from Squid always queue in users classes.
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