diff options
Diffstat (limited to 'private/ntos/afd/registry.txt')
| -rw-r--r-- | private/ntos/afd/registry.txt | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/private/ntos/afd/registry.txt b/private/ntos/afd/registry.txt new file mode 100644 index 000000000..614d113c8 --- /dev/null +++ b/private/ntos/afd/registry.txt @@ -0,0 +1,158 @@ +note: for items where i give three default values, the first is for +small machines (<12.5 MB), the second is medium machines (12.5 to 20 +MB) and the third is for large machines (> 20 MB). + +**** AFD is the driver which handles winsock. the following values +may be set under Services\Afd\Parameters: + +LargeBufferSize, REG_DWORD, default = 3876 +the size in bytes of large buffers used by AFD. smaller values use +less memory, larger values can improve performance. + +LargBufferListDepth, REG_DWORD, default = 0/2/10 +the maximum count of large buffers that AFD keeps in reserve. larger +numbers give better performance at the cost of physical memory. + +MediumBufferSize, REG_DWORD, default = 1504 +size of medium buffers. + +MediumBufferListDepth, REG_DWORD, default = 4/8/16 +max count of medium buffers in reserve. + +SmallBufferSize, REG_DWORD, default = 128 + +SmallBufferListDepth, REG_DWORD, default = 8/16/16 + +FastSendDatagramThreshold, REG_DWORD, default = 1024 +datagrams smaller than this get bufferred on send, larger ones are +pended. the default value was found by testing to be the best +overall value for performance. it is unlikely that anyone would want +to change this. + +StandardAddressLength, REG_DWORD, default = 24 +the length of TDI addresses typically used for the machine. if the +customer has a transport protocol like TP4 which uses very long +addresses, then increasing this value will result in a slight +performance improvement. + +DefaultReceiveWindow, REG_DWORD, default = 8192 +the number of receive bytes AFD will buffer on a connection before +imposing flow control. for some applications, a larger value here +will give slightly better performance at the expense of increases +resource utilization. note that applications can modify this value +on a per-socket basis with the SO_RCVBUF socket option. + +DefaultSendWindow, REG_DWORD, default = 8192 +as with DefaultReceiveWindow, but for the send side of connections. + +BufferMultiplier, REG_DWORD, default = 512 +DefaultReceiveWindow and DefaultSendWindow get divided by this value +to determine how many massages can be sent/received before flow +control is imposed. + +PriorityBoost, REG_DWORD, default = 2 +the priority boost AFD gives to a thread when it completes I/O for +that thread. if a multithreaded application experiences starvation +of some threads, reducing this value may remedy the problem. + +IrpStackSize, REG_DWORD, default = 4 +the count of IRP stack locations used by default for AFD. users +shouldn't need to change this. + +TransmitIoLength, REG_DWORD, default = PAGE_SIZE,PAGE_SIZE*2,65536 +the default size for I/O (reads and sends) performed by TransmitFile(). +Note that for the NT workstation product, the default I/O size is +exactly one page. + +IgnorePushBitOnReceives, REG_DWORD, default = 0 +If this value is zero (the default) and the TCP push bit is set on a +receive indication, then a larger then necessary buffer is passed down +to the TCP stack. This often gives a performance boost on receives. +If this value is non-zero, then the TCP push bit is ignored (this was +the behaviour of NT 3.1). + +MaxActiveTransmitFileCount, REG_DWORD, default = 0 +This value controls the maximum number of simultaneous TransmitFile +operations allowed. This registry value is only honored in the NT +Server product; NT Workstations always use a hardcoded (not configurable) +value. + +MaxFastTransmit, REG_DWORD, default = 65536 +This is the threshold count, in bytes, for the TransmitFile fast path to +fail. If the caller requests a send larger than this, it will never +go through the TransmitFile fast path. + +MaxFastCopyTransmit, REG_DWORD, default = 3876 +If a TransmitFile caller requests a send smaller than this size, the +operation is performed by doing a data copy from the file data to a system +buffer. This is slightly faster than direct I/O for small files, but for +larger files the copy overhead overwhelms the inherent efficiency of the +copy operation. + +**** the following keys are used by the RNR (service resolution and +registration) apis in winsock. these are all just "pointers" to +other stuff in the registry. users should never need to change +these. + +under CurrentControlSet\Control\ServiceProvider\Order, values: + +ExcludedProviders: a REG_MULTI_SZ that contains decimal values +corresponding to name space providers that should be excluded. +default is an empty set. some name space provider decimal values +include: + +#define NS_SAP (1) +#define NS_NDS (2) + +#define NS_TCPIP_LOCAL (10) +#define NS_TCPIP_HOSTS (11) +#define NS_DNS (12) +#define NS_NETBT (13) +#define NS_WINS (14) + +#define NS_NBP (20) + +#define NS_MS (30) +#define NS_STDA (31) +#define NS_CAIRO (32) + +#define NS_X500 (40) +#define NS_NIS (41) + +for example, setting ExcludedProviders to "1" "12" means that +GetAddressByName() will not attempt to use SAP or DNS when doing +typical name resolution operations. + +ProviderOrder: a REG_MULTI_SZ that contains strings corresponding to +keys under CurrentControlSet\Services. these keys must have a +ServiceProvider subkey which provides information about the name +space provider, especially Class and ProviderPath values. + +**** the following values are relevent to TCP/IP name resolution +(gethostbyname()) and the GetAddressByName() API. under +Services\Tcpip\ServiceProvider: + +Class, REG_DWORD, default = 8. should never change--this indicates +that TCPIP is a name service provider. + +DnsPriority, REG_DWORD, default = 0x7D0 +HostsPriority, REG_DWORD, default = 0x1F4 +LocalPriority, REG_DWORD, default = 0x1F3 +NetbtPriority, REG_DWORD, default = 0x7D1 +these priority values are used to determine the order of name +resolutions. low priority mechanisms are used first, so the default +order is local, hosts, dns, netbt. if someone wants a different name +resolution order, readjust the priority values as needed. note that +values under 1000 decimal are considered "fast" name resolution +providers, so putting network-based resolution mechanisms like dns +and netbt at values under 1000 may have weird effects. + +Name, REG_SZ, default = "TCP/IP" +no need to change. + +ProviderPath, REG_SZ, default = "%SystemRoot%\System32\wsock32.dll" +points to the dll that does tcpip name resolution. there is no need +to change this. + +**** there are other keys associated with netware name resolution. +chuck chan will comment on their names and meaning. |