Hi Adam
Thank you for your reply.
This seems strange to me too. I as mentioned am running my own application in
place of the Linux OS, below is the configuration of module and the .cfg used
(module.list)
entry[arch=arm64] VM-G
roottask moe rom/vm-g.cfg
module l4re
module ned
module cons
module io
module vm-g.cfg
module[arch=arm64,fname=icarmvpx3a.io] drivers.io
module uvmm
module[arch=arm64,fname=kernel.dtb] dtb/kernel.dtb
module[arch=arm64,fname=driver_ethernet,nostrip]
/home/user/Documents/TestEthernet/build/ethernet_loop
(vm-g.cfg)
-- vim:set ft=lua:
local L4 = require "L4";
local l = L4.default_loader;
local flags = L4.Mem_alloc_flags.Continuous
| L4.Mem_alloc_flags.Pinned
| L4.Mem_alloc_flags.Super_pages;
local align = 21;
-- start console server
local cons = l:new_channel();
l:start({ caps = { cons = cons:svr() },
log = L4.Env.log,
},
"rom/cons -a");
l.log_fab = cons;
local serialdev = { arm = "ttyAMA0", arm64 = "ttyAMA0", amd64 = "ttyS0" };
-- start io server
local vbus_l4 = l:new_channel();
l:start({
caps = {
vbus = vbus_l4:svr(),
icu = L4.Env.icu,
iommu = L4.Env.iommu,
sigma0 = L4.Env.sigma0,
},
log = { "IO", "y" },
l4re_dbg = L4.Dbg.Info,
scheduler = L4.Env.user_factory:create(L4.Proto.Scheduler, 0xa0,
0x80, 0x02);
},
"rom/io rom/drivers.io");
-- start vmm server
l:startv({
caps = {
ram = L4.Env.user_factory:create(L4.Proto.Dataspace, 0x30000000,
flags, align):m("rw"),
vbus = vbus_l4,
},
log = { "vm", "Black" },
l4re_dbg = L4.Dbg.Info,
scheduler = L4.Env.user_factory:create(L4.Proto.Scheduler, 0x18,
0x8, 0x02);
},
"rom/uvmm", "-v", "-i",
"-krom/ethernet_loop",
"-drom/kernel.dtb",
"-b0xC0000000",
"-cconsole=" .. serialdev[L4.Info.arch()] .. " rw"
);
To calculate the core usage time and get performance estimates I use the
following function:
uint32_t cnt_freq = read_cntfrq_el0();
start = read_cntpct_el0();
for (volatile uint64_t i = 0; i < counter; i++) {
__asm__ volatile("nop");
}
end = read_cntpct_el0();
uint64_t elapsed_ticks = end - start;
double time_ns = ((double)elapsed_ticks * 1e9) / cnt_freq;
I have done this count on different amounts of iterations, to give you an
estimate, I will only give you the one out of 1000 counts.
1) Application in bare metal => 2719 ns
2) Application on Linux vmm => 3680 ns
3) Application on vmm without Linux (i.e. the application of point 1) => 390880
ns
I hope you can help me understand how I can handle this situation correctly.
Thank you for your support
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