What does it mean if dmesg says this...

WARNING: mclpool limit reached; increase NMBCLUSTERS

...might it have something to do with AGP RAM? I had
caused Firefox to bog down and nearly lock up by visiting
a monstrously large TGP where the "thumbnails" were really
full-size screenshots scaled down to fit thumbnail-sized
windows. And I could not remember how much RAM I had in my
AGP. So I thought to get the info from dmesg and got the
above.

Thanks,