TX and RX Descriptors

Hello,
I tried searching on a lot of sites but need a conclusive answer. I am having problems with a highly-loaded servers, and concluded that the connection hangs ALWAYS for the first 80 packets then continues as normal ( eg. ping hangs for first 80 packets, then when it reaches the 81 it shows the first 80 packets as success ). After doing some research :
1. [Queue Lenghts|http://icfamon.dl.ac.uk/papers/DataTAG-WP2/reports/task1/20021205-goutelle.pdf]
The tx_ring and rx_ring are driverdependent
(e.g. the e1000 driver set theselengths to 80 packets) ;2. [e1000g|http://docs.sun.com/app/docs/doc/819-2254/e1000g-7d?a=view]
NumRxDescriptors
    Number of available receive descriptors. Multiple receive descriptors increase receive performance, but decrease available memory.
    80–4096
        Allowed values.
    1024
        Default.
NumTxDescriptors
    Number of transmit descriptors available to the driver. Mulitiple transmit descriptors increase transmit performance, but decrease available memory.
    80–4096
        Allowed values.
    1024
        Default.3. [e1000g_sw.h|http://fxr.watson.org/fxr/source/common/io/e1000g/e1000g_sw.h?v=OPENSOLARIS]
125 #define MIN_NUM_TX_DESCRIPTOR           80
126 #define MIN_NUM_RX_DESCRIPTOR           80Some drivers allow you to tune the size of the transmit ring or the number of transmit descriptors.
The hardware transmit queue controls the maximum number of buffers that can be queued to the adapter for concurrent transmission. One descriptor typically only points to one buffer and a message might be sent in multiple buffers. Many drivers do not allow you to change the parameters.
At this point I am somewhat lost and numerous ideas cross my head. Is the server running out of RX/TX descriptors to point to buffers? Confused.
If i got this all wrong please tell me. I am just putting head to head some bits and pieces of informations I got from around.
Would increasing the number of RX/TX descriptors in /kernel/drv/e1000g.conf would solve the problem at the cost of memory ?
My server is sun4v sparc SUNW,SPARC-Enterprise-T5220 with patch 138888-08, and though I have other system just like this one ( but with different applications on top) this is the only one behaving like so ( with 4 DBs on top ).
Thank you in advance.
Edited by: liviu.b on Sep 21, 2009 12:59 PM

Yes, your understanding is correct on this.

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I created a dynamic context and a dynamic table that use this dynamic context. I have the following error:*     *   The following error text was processed in the system XAP : Could not find attribute AMOUNT2009**
The error occurred on the application server sat190_XAP_00 and in the work process 0 .
The termination type was: RABAX_STATE
The ABAP call stack was:
      Method: IF_WD_CONTEXT_NODE_INFO~GET_ATTRIBUTE of program CL_WDR_CONTEXT_NODE_INFO======CP
      Method: GET_ATTRIBUTE_INFO of program CL_WDR_VIEW_ELEMENT_ADAPTER===CP
      Method: IF_WDR_VIEW_ELEMENT_ADAPTER~SET_CONTENT of program /1WDA/L3STANDARD==============CP
      Method: IF_WDR_VIEW_ELEMENT_ADAPTER~SET_CONTENT of program /1WDA/L3STANDARD==============CP
      Method: IF_WDR_VIEW_ELEMENT_ADAPTER~SET_CONTENT of program /1WDA/L3STANDARD==============CP
      Method: IF_WDR_VIEW_ELEMENT_ADAPTER~SET_CONTENT of program /1WDA/L3STANDARD==============CP
      Method: IF_WDR_VIEW_ELEMENT_ADAPTER~SET_CONTENT of program /1WDA/L8STANDARD==============CP
      Method: IF_WDR_VIEW_ELEMENT_ADAPTER~SET_CONTENT of program /1WDA/L8STANDARD==============CP
      Method: IF_WDR_VIEW_ELEMENT_ADAPTER~SET_CONTENT of program /1WDA/L8STANDARD==============CP
      Method: IF_WDR_VIEW_ELEMENT_ADAPTER~SET_CONTENT of program /1WDA/L7STANDARD==============CP
AMOUNT2009 is a new attribute that add to my context, i made the next code, can you review and say me where i have the error? I start with the second year is for this reason that i use a count.
Reading FINCATYGROUP
DATA lo_nd_fincatygroup TYPE REF TO if_wd_context_node.
DATA lo_el_fincatygroup TYPE REF TO if_wd_context_element.
DATA ls_fincatygroup TYPE wd_this->element_fincatygroup.
DATA : lv_year   type STRING,
          ls_attribute         type wdr_context_attribute_info, "To create dynamic node in the context
          lr_container         TYPE REF TO CL_WD_UIELEMENT_CONTAINER,
          lr_table             TYPE REF TO CL_WD_TABLE,
          lr_input_field       TYPE REF TO CL_WD_INPUT_FIELD,
          lr_cell_editor       TYPE REF TO if_wd_table_cell_editor,
          lr_column            TYPE REF TO CL_WD_TABLE_COLUMN,
          lr_column_header     TYPE REF TO CL_WD_CAPTION,
          lv_headerColumn      TYPE STRING,
          lv_id_input_field    TYPE STRING,
          lv_name              TYPE STRING,
          lv_id_table_column   TYPE STRING.
DATA: lr_node_info TYPE REF TO if_wd_context_node_info, "To get node info
lr_table_type TYPE REF TO cl_abap_tabledescr, "To get table and stuct descriptor
lr_line_type TYPE REF TO cl_abap_structdescr,
lt_components TYPE cl_abap_structdescr=>component_table, "To get component table
ls_components_line LIKE LINE OF lt_components, "One line of component table
lr_elem_type TYPE REF TO cl_abap_elemdescr.
    LOOP AT lv_periods_tt INTO lv_periods_ts.
get all declared attributes
      lv_periods_ts->get_static_attributes(
        IMPORTING
          static_attributes = ls_wa_period ).
navigate from <CONTEXT> to <FINCATYGROUP> via lead selection
      lo_nd_fincatygroup = wd_context->get_child_node( name = wd_this->wdctx_fincatygroup ).
      IF lv_cont = 1 OR lv_cont = 2.
        lv_cont = lv_cont + 1.
      ELSE.
Create dynamic context and dynamic view
get node_info
        lr_rootnodeinfo = lo_nd_fincatygroup->get_node_info( ).
        lv_year = ls_wa_period-zyear.
        SHIFT lv_year BY 15 PLACES LEFT.
        CONCATENATE 'AMOUNT' lv_year INTO lv_name.
put attributes of add_attrbute node
        CONCATENATE 'Y' lv_year INTO ls_attribute-name.
        ls_attribute-name = lv_name.
        ls_attribute-type_name = '\TYPE=/RPM/TV_CURR_AMOUNT'.
        lr_rootnodeinfo->add_attribute( "Add attribute for amount of year
          EXPORTING
            attribute_info = ls_attribute ).
********************* table *******************************************************
Get ROOTUIELEMENTCONTAINER
        lr_container ?= view1->get_element( 'ROOTUIELEMENTCONTAINER ' ).
Get TABLEFCG
        lr_table ?= view1->get_element( 'TABLEFCG' ).
Create cell_editor
        CONCATENATE 'TABLEFCGIF_Y' lv_year '_EDITOR' INTO lv_id_input_field.
        lr_input_field = cl_wd_input_field=>new_input_field(
                              id = lv_id_input_field bind_value = ls_attribute-name ).
        CONCATENATE 'TABLEFCG_Y' lv_year '_EDITOR' INTO lv_headerColumn.
        lr_column_header = cl_wd_caption=>new_caption( id = lv_headerColumn ).
        lr_column_header->set_text( ls_attribute-name ).
Create table column
        CONCATENATE 'TABLEFCG_' lv_year 'COLUMN' INTO lv_id_table_column.
        lr_column = cl_wd_table_column=>new_table_column( id = lv_id_table_column ).
        lr_column->set_table_cell_editor( lr_input_field ).
        lr_column->set_header( lr_column_header ).
        lr_table->add_grouped_column( lr_column ).
********************* end table *******************************************************
      ENDIF.
    ENDLOOP.
Thanx.

1.
Code if the Transparent container's layout is Matrix ( method WDDOMODIFYVIEW )
data lr_container type ref to cl_wd_transparent_container.
data lr_input        type ref to cl_wd_input_field.
data lr_layout_data type ref to cl_wd_matrix_head_data.
   lr_container ?= view->get_element( '<Transparent container ID>' ).
   lr_input = cl_wd_input_field=>new_input_field( bind_value = '<node>.<attribute>'
view = view
                                                                                ID = 'INP' ).
   lr_layout_data = cl_wd_matrix_head_data=>new_matrix_head_data( element = lr_input width = '100%' ).
2.
Dynamic Context Attribute in a node.
data lr_node     type ref to if_wd_context_node.
data lr_info       type ref to if_wd_context_node_info.
data ls_attr       type WDR_CONTEXT_ATTRIBUTE_INFO.
lr_node = wd_context->get_child_node( '<Node_name>' ).
lr_info   = lr_node->get_node_info( ).
ls_attr-name = '<attribute_name>'.
ls_attr-type_name = 'STRING'.
lr_info->add_attribute( ls_attr ).

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