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 - : send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
