Hi,
> scsi optimal_io_size changed
> from 0 on kernel 6.6,
> to 16773120(32760*512, 4095*4096) on kernel 6.12/6.16
>
> I tested in on same device and same os dist, but different kernel version.
> both ssd/sas and ssd/sata connected to same hba(mpi3sas driver).
>
> Is there some feature that changed the default value?
we walked around this problem with a local dirty fix.
diff --git a/drivers/scsi/scsi_transport_sas.c b/drivers/scsi/scsi_transport_sas.c
index 351b028ef893..638dbafd695d 100644
--- a/drivers/scsi/scsi_transport_sas.c
+++ b/drivers/scsi/scsi_transport_sas.c
@@ -240,6 +240,9 @@ static int sas_host_setup(struct transport_container *tc, struct device *dev,
if (dma_dev->dma_mask) {
shost->opt_sectors = min_t(unsigned int, shost->max_sectors,
dma_opt_mapping_size(dma_dev) >> SECTOR_SHIFT);
+ /* /sys/block/sda/queue/optimal_io_size 16773120(32760*512, 4095*4096) @T7610 @kernel 6.12+ */
+ shost->opt_sectors = min_t(unsigned int, shost->opt_sectors,
+ SZ_1M >> SECTOR_SHIFT);
}
return 0;
Best Regards
Wang Yugui (wangyugui@xxxxxxxxxxxx)
2025/06/25
