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Operating Systems AIX AIX server problem - network connection is unstable ! Post 303045091 by zxmaus on Wednesday 11th of March 2020 07:53:55 PM
Old 03-11-2020
ok - so you have some link aggregations with 100/1000 and some with 10G adapters. The 10G will almost always be faster. Considering how many 10G ports you have on your box, you may want to consider to move all of them to 10G instead? That would make tuning your network much easier.

If / when you do this, after long and exhausting RAC testing on our systems (similar hardware), we have found below network tunables to be the most beneficial for us. But be careful - do not change all of them at once - but one by one and see if your performance gets better, worse or remains the same.
You can change them via no -p -o name=value - note there is NO space before and after the equal sign in the command to change them.

Code:
hstcp = 1
lo_perf = 1
rtentry_lock_complex = 1
sack = 1
sb_max = 33554432
tcp_ephemeral_high = 65535
tcp_ephemeral_low = 32768
tcp_init_window = 16
tcp_nodelayack = 1
tcp_recvspace = 8388608
tcp_sendspace = 8388608
udp_ephemeral_high = 65535
udp_ephemeral_low = 32768
udp_recvspace = 655360
udp_sendspace = 65536

in addition, you probably want to put this into your /etc/netsvc.conf
hosts=local,bind4
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ixgb(7d)							      Devices								  ixgb(7d)

NAME
ixgb - SUNWixgb, 10G Gigabit Ethernet driver for Intel 82597ex controllers and Sun Kirkwood adapters SYNOPSIS
/dev/ixgb DESCRIPTION
The ixgb 10Gigabit Ethernet driver is a multi-threaded, loadable, clonable, GLD-based STREAMS driver supporting the Data Link Provider Interface, DLPI, on Intel 82597ex 10 Gigabit Ethernet controllers and Sun 10G Kirkwood adapters. The Intel 10G controller incorporates both MAC and PHY functions and provides 10G (fiber) Ethernet operation on the SR and LR connectors. The Sun Kirkwood adapter is a 133 MHz PCIX 10 Gig Ethernet card utilizing the Intel 82597EX PCIX MAC controller with XFP-based 10GigE optics. The ixgb driver functions include controller initialization, frame transmit and receive, promiscuous and multicast support and error recov- ery and reporting. The ixgb driver and hardware support auto-negotiation, a protocol specified by the 802.ae specification. APPLICATION PROGRAMMING INTERFACE
The cloning character-special device /dev/ixgb is used to access all Intel 10G controllers and Sun Kirkwood adapters installed within the system. The ixgb driver is dependent on /kernel/misc/gld, a loadable kernel module that provides the ixgb driver with the DLPI and STREAMS func- tionality required of a LAN driver. See gld(7D) for more details on supported primitives. You must send an explicit DL_ATTACH_REQ message to associate the opened stream with a particular device (PPA). The PPA ID is interpreted as an unsigned integer data type and indicates the corresponding device instance (unit) number. The driver returns an error (DL_ERROR_ACK) if the PPA field value does not correspond to a valid device instance number for the system. The device is initialized on first attach and de- initialized (stopped) at last detach. The values returned by the driver in the DL_INFO_ACK primitive in response to the DL_INFO_REQ are as follows: o Maximum SDU is 1500 (ETHERMTU - defined in <sys/ethernet.h>). o Minimum SDU is 0. o DLSAP address length is 8. o MAC type is DL_ETHER. o SAP length value is -2 meaning the physical address component is followed immediately by a 2 byte SAP component within the DLSAP address. o Broadcast address value is Ethernet/IEEE broadcast address (FF:FF:FF:FF:FF:FF). Once in the DL_ATTACHED state, you must send a DL_BIND_REQ to associate a particular Service Access Point (SAP) with the stream. By default, the ixgb driver performs auto-negotiation to select the 10G link speed. FILES
/dev/ixgb ixgb special character device. /kernel/drv/sparcv9/ixgbixgb driver binary. /kernel/drv/amd64/ixgb 64-bit kernel module (x86 only.) ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Architecture |SPARC, x86 | +-----------------------------+-----------------------------+ SEE ALSO
attributes(5), gld(7D), streamio(7I), dlpi(7P) Writing Device Drivers STREAMS Programming Guide Network Interfaces Programmer's Guide SunOS 5.10 1 Dec 2004 ixgb(7d)
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