On Sat, 9 Apr 2005 19:35:52 -0700 (PDT) sai narasimhamurthy wrote:
| Hi,
| I had posted a question on increasing the scsi
| read/write sectors per command. I figured out some of
| the things, but many questions still exist.
|
| I was wondering why the maximum writes I could get
| from a single scsi write command could never exceed
| 204
| 4096B segments . I traced it to :
|
| static const int scsi_max_sg = PAGE_SIZE /
| sizeof(struct scatterlist)
|
| in scsi_merge.c .(which amounts to 204)
|
| Is this the limit of the maximum blocks we can
| read/write through a single scsi command, atleast for
| the given kernel (2.4.29) ? How can I increase
| it??????
|
| I am on a P3 Dell poweredgde 2400 .
Did you read the comment immediately above that
calculation?
/*
* scsi_malloc() can only dish out items of PAGE_SIZE or less, so we cannot
* build a request that requires an sg table allocation of more than that.
*/
so scsi_malloc() would need some reworking to handle more.
OTOH, it appears that this is all removed in 2.6.10++, so moving to
2.6.recent is probably your best choice.
---
~Randy
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