Performance (iops) becomes bad, what is the reason?

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tran_sync_pkt

tran_sync_pkt(9E)						Driver Entry Points						 tran_sync_pkt(9E)

NAME

       tran_sync_pkt - SCSI HBA memory synchronization entry point

SYNOPSIS

       #include <sys/scsi/scsi.h>

       void prefixtran_sync_pkt(struct scsi_address *ap, struct scsi_pkt *pkt);

INTERFACE LEVEL

       Solaris architecture specific (Solaris DDI).

PARAMETERS

       ap	A pointer to a scsi_address(9S) structure.

       pkt	A pointer to a scsi_pkt(9S) structure.

DESCRIPTION

       The  tran_sync_pkt()  vector  in  the scsi_hba_tran(9S) structure must be initialized during the HBA driver's attach(9E) to point to an HBA
       driver entry point to be called when a target driver calls scsi_sync_pkt(9F).

       tran_sync_pkt() must synchronize a HBA's or device's view of the data associated with the pkt, typically by calling  ddi_dma_sync(9F).  The
       operation  may  also  involve  HBA  hardware-specific  details,	such as  flushing I/O caches, or stalling until hardware buffers have been
       drained.

SEE ALSO

       attach(9E),   tran_init_pkt(9E),   ddi_dma_sync(9F),   scsi_hba_attach(9F),   scsi_init_pkt(9F),    scsi_sync_pkt(9F),	 scsi_address(9S),
       scsi_hba_tran(9S), scsi_pkt(9S)

       Writing Device Drivers

NOTES

       A target driver may call tran_sync_pkt() on packets for which no DMA resources were allocated.

SunOS 5.10							    1 Nov 1993							 tran_sync_pkt(9E)

Solaris