[Scst-devel] tcp mem params. what is the best?

[<ro...@ar...>]

hello, Scst-devel.

After  searching  of internet I'm found this parameters of kernel. Now they are set to values shown below.

net.core.rmem_max = 8738000
net.core.rmem_default = 1048576
net.core.wmem_max = 6553600
net.core.wmem_default = 1048576
net.ipv4.tcp_mem = 1048576 2097152 4194304
net.ipv4.tcp_rmem = 8192 873800 8738000
net.ipv4.tcp_wmem = 4096 655360 6553600

our iSCSI target system is raid 5 of 4 2TB sata disks.
while  we are using default parameters kernel had many memory page allocation
errors,  resulting  in inaccessible storage system. after modifying to
this   values  we are forgot this problems till now. Last night during
a heavy load on the server(backup, raid rechecking), the problem returned.

How  i  must  configure  this  values to forget about this memory page
allocation  problems?  Also  I can't fully understand what this values
do.

-- 
best regards,
 Romb                          mailto:ro...@ar...