Does anyone know what Tools->Profile->SPI mean?
It eats near 25-30% processors time of my RB2011UAS, v6.4
SPI basically means, that your firewall ACLs are statefull as compared to stateless. It's the feature which allows you to have rules whith conditions like "established" or "related" and is needed for NAT. I think you confuse it with IPS intrusion prevention system, am I right?You read my mind. when SPI eating CPU .... I was looking on our Border Firewall for Attack Kind of Sessions. I found NONE. So in my experience SPI joust activate himself .... without any exterior reason. I believe is something wrong in software, or something missing in software. (software means 5.6 or 6.5)
+1I'm gonna wake this topic because i'm facing SPI.
Does anyone one what is this "SPI"??
I would think that would fall under the category of firewall as conntrack is a component of iptables.What about the stateful packet inspection?
My understanding is that all SOHO device in the current line of products (i.e. those with only 16MB of flash) also have Flash drive sitting on the SPI bus.SPI stands for Serial Peripheral Interface. It is one of the buses on the router that is used to talk to certain components, like the LCD panel as previously stated.
Like you, i disabled the option /lcd and voa lá my CPU is bellow then 10%. Thanks for explanation.SPI stands for Serial Peripheral Interface. It is one of the buses on the router that is used to talk to certain components, like the LCD panel as previously stated. Anyone that has ever message with an Arduino should be familiar with this type of bus.
https://en.wikipedia.org/wiki/Serial_Pe ... erface_Bus
I was seeing 30% CPU utilization on a router today and all of the usage was on SPI. I went into the LCD configuration and changed it to "Read Only Mode" and the usage dropped down to 2-4% for SPI in the profile tool and now the router is sitting at ~8% CPU utilization with SPI only using 2-4% periodically, which makes sense because if that is the router updating the LCD screen and I am running the "stats slideshow" for the WAN interface on the LCD, so I would expect some CPU utilization there as it updates the graphs.