what these errors mean ?

Hi

i have a lot of errors like these in my /var/messages

can some one explain them ?

Code: 
Sep  7 01:19:09 server kernel: PCI-DMA: Out of IOMMU space for 163840 bytes at device 0000:00:07.1
Code: 
Sep  7 01:19:09 server kernel: ** OUT_TCP DROP ** IN= OUT=eth0 SRC=216.32.86.xx DST=200.201.164.9 LEN=1420 TOS=0x00 PREC=0x00 TTL=64 ID=3978 DF PROTO=TCP SPT=80 DPT=29790 WINDOW=6930 RES=0x00 ACK URGP=0
Code: 
Sep  7 01:20:56 server kernel: ** IN_UDP DROP ** IN=eth0 OUT= MAC=00:e0:81:31:8f:f6:00:0f:34:b7:dc:7f:08:00 SRC=221.208.208.196 DST=216.32.86.xx LEN=339 TOS=0x00 PREC=0x00 TTL=49 ID=0 DF PROTO=UDP SPT=60469 DPT=1027 LEN=319

 

 

 

 

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